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Process and apparatus for the preparation of alkylene glycol

A process and equipment technology, applied in the field of process and equipment for the preparation of alkylene glycol, capable of solving problems such as adverse effects of monoethylene glycol selectivity

Active Publication Date: 2021-06-15
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, the presence of ethylene oxide in the downstream section operating at a higher temperature than the absorber can adversely affect the selectivity of the process to monoethylene glycol

Method used

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  • Process and apparatus for the preparation of alkylene glycol
  • Process and apparatus for the preparation of alkylene glycol
  • Process and apparatus for the preparation of alkylene glycol

Examples

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Embodiment Construction

[0022] The invention provides a process and equipment for preparing alkylene glycol. Alkylene glycols are generally produced from the corresponding alkylene groups as described below:

[0023]

[0024] R 1 , R 2 , R 3 and R 4 It is preferably selected from hydrogen or an optionally substituted alkyl group having 1 to 6 carbon atoms, more preferably 1 to 3 carbon atoms. As a substituent, a moiety such as a hydroxyl group may be present. Preferably, R 1 , R 2 and R 3 represents a hydrogen atom, and R 4 represents hydrogen or unsubstituted C1-C3 alkyl, and more preferably, R 1 , R 2 , R 3 and R 4 Both represent hydrogen atoms.

[0025] Thus, examples of suitable alkylene glycols include ethylene glycol and propylene glycol. In the present invention, the most preferred alkylene glycol is ethylene glycol. In the present invention, the gas composition comprising alkylene oxide, olefin, oxygen, carbon dioxide and water vapor is preferably derived from the reactor pr...

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PUM

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Abstract

Disclosed is process for the preparation of an alkylene glycol from an alkene. The process comprises the following steps: a) supplying a gas composition to an alkylene oxide absorber through a gas inlet, the absorber comprising an absorption section and a sump, and allowing the gas composition to pass upwards; b) supplying a lean absorbent to the top of the absorption section and allowing the lean absorbent to pass downwards; c) intimately contacting the gas composition with lean absorbent in the absorption section in the presence of one or more catalysts that promote carboxylation and hydrolysis; and d) withdrawing fat absorbent from the absorption section and passing the fat absorbent and any liquid condensate through the sump, wherein the sump comprises one or more baffles that define a flow pathway from a sump inlet to a sump outlet between the one or more baffles.

Description

technical field [0001] The present invention relates to a process and a plant for the preparation of alkylene glycols from the corresponding olefins. Background technique [0002] Monoethylene glycol is used as a raw material for the production of polyester fibers, polyethylene terephthalate (PET) plastics and resins. It is also incorporated into automobile antifreeze. [0003] Monoethylene glycol is usually prepared from ethylene oxide, which in turn is prepared from ethylene. Ethylene and oxygen are passed over a silver oxide catalyst, typically at a pressure of 10-30 bar and a temperature of 200-300°C, to produce a product stream comprising ethylene oxide, carbon dioxide, ethylene, oxygen and water. The amount of ethylene oxide in the product stream is generally about 0.5 to 10 weight percent. The product stream is supplied to an ethylene oxide absorber, and the ethylene oxide is absorbed by a recycled solvent stream mainly comprising water. The ethylene oxide deplete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/10C07C31/20B01D3/22
CPCC07C29/106C07C31/202B01D3/008B01D3/20B01D3/324
Inventor J·R·布莱克P·M·威尔金森C·P·恩博斯基R·G·H·L·巴斯廷格斯B·I·M·滕博施
Owner SHELL INT RES MAATSCHAPPIJ BV