Early symptoms include intoxication, vomiting and abdominal pain. This process is catalyzed by using acids, bases or can even occur at the acidic or. This project report deals with the design calculations of mono ethylene glycol production from ethylene oxide as a feed stock along with their relevant aspects such as instrumentation and process control, hazop study and cost estimation. The invention provides a process for the production of ethylene glycol from ethylene.
Ethylene glycol eg ethylene glycol c 2h 4oh 2 is produced from ethylene oxide through a catalytic reaction with water at higher temperature resulting in a yield of mono ethylene glycol meg, known as glycol, and the byproducts di ethylene glycol deg and tri ethylene glycol teg. Ethylene glycol is also used in hydraulic brake fluids and inks used in stamp pads. Ethylene glycol eg production and manufacturing process 20101224 ethylene glycol used to be manufactured by the hydrolysis of ethylene oxide eo which was produced via ethylene chlorohydrin but this method has been superseded by a direct oxidation route. An important feature of the process is the negligible production of diethylene glycol deg and triethylene glycol teg, which occur as byproducts in other ethylene glycol production processes.
The world meg production capacity for the year 2016 was 34. The present invention relates to a process for producing ethylene glycol from ethylene oxide wherein ethylene oxide in a gas resulting from oxidation of ethylene is absorbed in a specific absorbing solution, is allowed to react with carbon dioxide, converted into ethylene carbonate, and then subjected to hydrolysis to produce ethylene glycol. The present invention relates to a process for the production of ethylene glycol. In the described process, meg is produced via eo, which is manufactured in an integrated plant utilizing shell eo technology. An ethylene glycol stream comprises inorganic chloride contaminants and the process comprises steps of converting the inorganic chloride contaminants to 2chloroethanol by reaction with ethylene oxide in one or more dehydration columns, and removing 2chloroethanol in a waste water stream. A toxicological profile for ethylene glycol, draft for public comment was released in october 2007.
For the purposes of this letter, dtsc will refer to that facility as the texas facility. The glycol dehydration process is an example of a process that provides absorption dehydration, and in the process, a liquid desiccant provides the means to absorb water from the gas stream. In this process, ethylene oxide reacts with water to produce ethylene glycol according to the desired chemical equation. This edition supersedes any previously released draft or final profile. Ethylene glycol manufacture technology free library. Workers may be harmed from exposure to ethylene glycol. Ethylene glycol has become the most important ethylene derived industrial chemical of the world. The first reaction converts ethanol to ethylene oxide, and the second converts ethylene oxide to ethylene glycol. Physical properties the chemical formula for ethylene glycol is c 2 h 6 o 2, and its molecular weight is 62. Monoethylene glycol meg accounts for more than 90% of the. Uses advised against not for food, drug, pesticide or biocidal product use. Process design for the production of ethylene from ethanol. Glycol dehydration process an overview sciencedirect.
This process produces chiefly mono, di and triethylene glycols and a small amount of tetraethylene and heavier glycols. The first step in the production of ethylene is to take the feedstock and crack it into ethylene and other various products in a furnace. Ethyleneglycol methodologyconsultation2019 summary of responses icis received 3 responses and this summary takes into account all of. Since eo is very reactive and hazardous to handle and ship. Ethylene glycol is the most common antifreeze fluid for standard heating and cooling applications. The process is fed 237,000 metric tons of ethanol per year and creates 245,000 metric tons of monoethylene glycol per year. Ethylene glycol via omega process ethylene glycol degteg product slate via ethylene oxidation ethylene oxide hydration. Technical insights into uninhibited ethylene glycol. Pervaporation dehydration of ethylene glycol by naa zeolite membranes article in chemical engineering research and design 909. The reaction of the ethylene oxide and water to form ethylene glycol is a noncatalytic reaction. Ethylene glycol production chemical engineering page 1. Ethylene glycol manufacture technology from ethylene. Toxicity and death may occur after drinking even a small amount.
Human health aspects please note that the layout and pagination of this pdf file are not necessarily identical to the hard copy first draft prepared by r. Long term outcomes may include kidney failure and brain damage. C in addition at neutral or acidic conditions distribution is unchanged,while at basic catalysts i. The major byproducts are the ethylene glycol oligomers diethylene glycol, triethylene glycol, and tetraethylene glycol. In 1995 the world capacity for ethylene glycol was about 9. Mono ethylene glycol production capacity by region. This compound is produced from the hydration of eo which may produce in addition to ethylene glycol diethylene glycols and triethylene glycols. Ethylene glycol process mitsubishi chemical corporation.
Ethylene glycol, diethylene glycol, and triethylene glycol by conventional noncatalyzed hydration of ethylene oxide 38 6 process operations for transfer of ethylene oxide to the ethylene glycol plant 39 7 basic operations that may be used in the production of. A novel 2step process abstract ethylene glycol demand is growing rapidly, particularly in the global polyethylene terephthalate markets. Consultation paper gmc1419 is part of this formal process and covers all of the icis primary price points included in the ethylene glycol weekly publications. Ethylene glycol hoch 2 ch 2 oh was, initially, the principal chemical agent in this process, has a very strong affinity for water and when the glycol is in contact with a stream of waterwet natural gas, the ethylene glycol absorbs the water from the gas stream. The global production was dominated by asian countries which accounted for 15. The effluent from the glycol reactor goes to the evaporator section to remove. Ethylene oxide ethylene glycol process flow diagram scribd. Ethylene oxide hydration route also produces small amount of the di, tri and. Ethylene glycol, also called ethane1,2diol, the simplest member of the glycol family of organic compounds. Ethylene oxide reacts with water to produce ethylene glycol according to the chemical equation. Ethylene glycol price report compliance and methodology. Process improvement with intensification concept in process intensification concept, the basecase flow sheet is broken down into smaller structures via equipment level, task level and phenomena level. It was produced on a small scale during world war i. Jun 09, 1998 the present invention relates to a process for producing ethylene glycol from ethylene oxide wherein ethylene oxide in a gas resulting from oxidation of ethylene is absorbed in a specific absorbing solution, is allowed to react with carbon dioxide, converted into ethylene carbonate, and then subjected to hydrolysis to produce ethylene glycol.
Under california law, sterigenics waste ethylene glycol solution is used at the texas facility in an industrial process which includes. Conventional thermal processes coproduce about 10% diethylene and heavier glycols. This process typically yields about 9092% monoethylene. Ethylene glycol is widely used to inhibit the formation of natural gas clathrates hydrates in long multiphase pipelines that convey natural gas from remote gas fields to a gas processing facility. Identification product name ethylene glycol cat no. Monoethylene glycol meg, also known as ethylene glycol eg or simply glycol, is a diol mostly used for the production of polyester fibers and polyethylene terephthalate pet resins.
Mono ethylene glycol meg is used primarily at lowtemperature processing plant for extracting natural gas liquids. Later symptoms may include a decreased level of consciousness, headache, and seizures. This monograph includesthe ntp brief on ethylene glycol, a listof expert panel members appendix i. Process economics program report 2i ethylene glycol. Yes, the treatment process at the texas facility impacts the erm status of sterigenics waste ethylene glycol solution. Process improvement with intensification concept in process intensification concept, the basecase flow sheet is broken down into smaller structures via equipment level. Toxicological profiles are revised and republished as necessary. Water from the process of hydrolysis is evaporated from the mixture and reused.
Process description continued the glycol feed stripper bottoms going to the glycol reactor is preheated and flows through a 24 pipe reactor 633 long. The chemical formula for ethylene glycol is c 2 h 6 o 2, and its molecular weight is 62. Us8802900b2 process for the preparation of ethylene. Meek, health canada, ottawa, canada published under the joint sponsorship of the united nations environment programme, the. Safety data sheet creation date 02feb2010 revision date 17jan2018 revision number 4 1. Hacettepe university chemical engineering department ethylene glycol design aylin kangalli ayse dilara aydin seher balkanli tugba tuncel ethylene glycol was first prepared in 1859 by the french chemist charlesadolphe wurtz. Initially, the process used ethylene glycol as the absorbent but, with the advancement of the technology, glycol dehydration now involves the use of an aqueous solution of a glycol derivative in which the glycol is either diethylene glycol deg or triethylene glycol teg table 7. A paper on manufacturing of ethylene glycol ethylene glycol is nowadays one of the most industrially important chemical. This process harnesses synthesis gas syngas, made from coal, to produce ethylene. Due to its demand and a vast application area lot of research is going on for improving its production statistics. The recovered ethylene glycol is recirculated in the scrubber system, and part of the spent ethylene glycol from the scrubber system is sent to storage in process tanks, after which it is sent to the ethylene glycol recovery system 14.
Ethylene glycol chemical production and investment cost. World scale ethylene glycol plant complete plants, process. Ethylene glycol can be recovered from the natural gas and reused as an inhibitor after purification treatment that removes water and inorganic salts. The glycol distribution from the reactor is essentially unaffected by changes in pressure and temperature over the ranges 1 30 bars, 90 200. This is the main advantage of this new technology that it selectively. Ethylene glycol has many uses, including as antifreeze in cooling and heating systems, in hydraulic brake fluids, and as a solvent. Ethylene glycol poisoning is poisoning caused by drinking ethylene glycol. Glycol dehydration process an overview sciencedirect topics. Ethylene glycol is a precursor for many polymers, eg. Mono ethylene glycol meg market size, share, price.
Us8802900b2 process for the preparation of ethylene glycol. First, the basecase design was obtained, resulting in the production of ethylene glycol via two steps. Process analytics in ethylene oxide and ethylene glycol plants. Therefore, a cheaper process of creating ethylene is highly sought in todays economy, and the original production method of ethanol dehydration is being reconsidered. Ethylene glycol concentration500mgl or presence of severe metabolic acidosis, renal failure, severe electrolyte imbalance, or generally deteriorating. Sigmaaldrich offers a number of poly ethylene glycol products. Under these conditions, ethylene glycol yields of 90% can be achieved. Typically a physical process plant comprises with gas dehydration system which. July 1, 2014 product uses1,4 ethylene is primarily used as a reactive monomer chemical building block make polyethylene and as an intermediate in the production of other organic compounds, such as ethylene dichloride and ethylene oxide. Ethylene glycol is odorless, but has a sweet taste. Intensification of ethylene glycol production process sciencedirect.
Selective catalytic twostep process for ethylene glycol. Dioxane the dimer of ethylene glycol which causes coma and hepatic renal failure dipropylene glycol, which causes cns depression diethylene glycol, which causes hideous renal failure even in small doses. Ethylene glycol iii update statement a toxicological profile for ethylene glycol, draft for public comment was released in october 2007. Ethylene glycol is a liquid inhalation ethylene glycol is a colorless liquid. A glycol is an alcohol with two hydroxyl groups on adjacent carbon atoms a 1,2diol. Shell omega is the first process to enable ethylene glycol production via a fully catalytic process. Pdf production of ethylene glycol from coal researchgate. Ethylene glycol has become one of the worlds important industrial chemicals. Pdf ethylene glycol eg is an important organic compound and chemical intermediate used in a large number of industrial processes e. It is also used in antifreeze applications and in pharmaceuticals and cosmetics.
The cerhr received numerous public comments throughout the evaluation process. Ethylene glycol eg production and manufacturing process. Calculation of ethylene glycol production in a reactionrectification. Jul 01, 2002 industrially inhibited ethylene glycol contains approximately 93 percent uninhibited ethylene glycol, 3 percent water and 3 percent inhibitors. Ethylene oxideethylene glycol nexant subscriptions. The report examines research work and technical developments taking place in the ethylene glycol. Ethylene ethylene glycol and glycoaldehyde glycoaldehyde increase serum osmolarity occurs early on, may disappear later as ethylene glycol and glycoaldehyde. Ethylene glycol should be avoided if there is a slightest chance of leakage to potable water or food processing systems. It can harm the eyes, skin, kidneys, and respiratory system. Removes ethylene glycol and glycolate effectively indications. Industrially inhibited ethylene glycol contains approximately 93 percent uninhibited ethylene glycol, 3 percent water and 3 percent inhibitors. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. In 1995, their production volumes ranked them among the top 20 organic chemicals in the united states. Acute shortterm exposure of humans to ethylene glycol by ingesting large quantities causes three stages of health effects.
Thetp n has prepared an ntpcerhr monographfor ethylene glycol. This process typically yields about 9092% monoethylene glycol meg and 810% heavier glycol products, mainly diethylene glycol deg and triethylene glycol teg. The common name ethylene glycol literally means the glycol derived from ethylene. In its correspondence with dtsc, sterigenics did not identify the name of the recycling facility in texas where the waste ethylene glycol solution is sent. Sigmaaldrich offers a number of ethylene glycol products.
Petro rabigh produces 600 kta of mono ethylene glycol meg through the most uptodate process and sells only in bulk quantities via petro rabigh terminal. Some of the noted trends in the global mono ethylene glycol meg market includes product launch and process developments, for instance, shell global developed a new catalytic process called omega only meg advantage for producing meg from ethylene oxide which produces virtually no byproducts and achieves an efficiency of 99% conversion. Monoethylene glycol, diethylene and triethylene glycol are separated using their. Ethylene glycol hoch 2 ch 2 oh was, initially, the principal chemical agent in this process, has a very strong affinity for water and when the glycol is in contact with a stream of waterwet natural gas. According to the licenser, the process is able to achieve eotoeg converstion and selectivity near 100%, leading to production of meg only. Among these products, ethylene glycol eg is an important bulk chemical with an annual production and consumption of more than 20 million tons 6.
Furnace the two primary feedstocks for ethylene production are naphtha and natural gas ethane, propane, butane, etc. This column describes the production of monoethylene glycol from ethylene via a process similar to shells omega catalytic process. As a prevalent industrial product, this c2 diol finds widespread applications in different fields, for example, as a solvent, antifreeze agent and precursor for the manufacture of polyester fibres. Monoethylene glycol, diethylene and triethylene glycol are separated using their different boiling points under vacuum. Asia holds a prominent share in the global market production of meg. Mar 26, 2019 the ethylene glycol solution is sent for recycling and used to make a product. However, with increasing global demand for hydrocarbons and increasingly stricter environmental regulations, this process for ethylene production has proven to become very. Meg is produced from ethylene, via the intermediate ethylene oxide. Ethylene glycol is used to manufacture antifreeze and deicing solutions for cars, airplanes, and boats. The functionality of this process reversed industrial trends, turning ethylene into a raw material for ethanol, as opposed to a derivative of it. The most popular process for the manufacture of ethylene glycol is the direct hydration of ethylene oxide via the reaction. Instead solutions based on propylene glycol are commonly used. Ethylene glycol is commonly used as an antifreeze agent.
Raw ethylene glycol is formed when ethylene oxide is hydrolyzed under pressure at ratio of 10. Ethylene oxide ethylene glycol process flow diagram free download as word doc. In the standard thermal glycol reaction process, eo and water are reacted at an elevated temperature about 200c and pressure without catalyst. Pdf production of mono ethylene glycol by hydrolysis of. Ntpcerhr monograph on the potential human reproductive. The estimation of mono ethylene glycol meg concentration is an essential criterion during the industrial regeneration of meg to evaluate the efficiency of regeneration process and to control the. Ethylene glycol is a diol, an alcohol with a molecular structure that contains two hydroxyl oh groups, and terephthalic acid is a dicarboxylic aromatic acid, an acid with a molecular structure that contains a large, sixsided carbon or aromatic ring and two carboxyl co2h groups. Process economics program report 2f ethylene oxide and ethylene glycol january 1997 ethylene oxide eo and ethylene glycol eg are widely used industrial organic intermediates.
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