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Process and system for producing ethylene carbonate and/or ethylene glycol

A technology of ethylene carbonate and ethylene glycol, applied in chemical instruments and methods, separation methods, sustainable manufacturing/processing, etc., can solve problems such as chloride stress corrosion, inorganic chloride accumulation, etc.

Pending Publication Date: 2022-04-12
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, these organic chlorides can lead to the accumulation of inorganic chlorides
Inorganic chlorides can start to precipitate again and can lead to chloride stress corrosion

Method used

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  • Process and system for producing ethylene carbonate and/or ethylene glycol
  • Process and system for producing ethylene carbonate and/or ethylene glycol

Examples

Experimental program
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Embodiment Construction

[0025] As described below, the process of the present invention comprises various steps. The process may contain one or more intermediate steps between these steps. Furthermore, the process may comprise one or more additional steps before the first mentioned step and / or after the last mentioned step.

[0026] Although the methods and systems of the present invention and the mixtures or streams used in said methods use the terms "comprising", "containing" or "including" one or more of the various described steps and components, but they may also "consist essentially of" or "consist of" one or more of the various described steps and components ".

[0027] In the context of the present invention, where a mixture, stream or catalyst comprises two or more components, these components are selected in a total amount not exceeding 100%.

[0028] In this specification, "substantially free" means that no detectable amount of said component is present in the catalyst or composition. ...

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Abstract

The present invention relates to a process for producing ethylene carbonate and / or ethylene glycol, said process comprising the steps of: a) supplying an overhead absorber stream drawn from an absorber to a vapor-liquid separator to produce a water-containing tower bottoms stream and a recycle gas stream; b) supplying an aqueous process stream comprising one or more impurities to a distillation unit to produce an overhead impurity stream and a purified aqueous process stream wherein the aqueous process stream supplied to the distillation unit comprises at least a portion of the aqueous tower bottoms stream withdrawn from the vapor-liquid separator, wherein the overhead impurity stream is supplied to a condenser and cooled to a temperature in the range of 5 to 95 DEG C wherein the cooled overhead impurity stream is separated into a reflux stream and an overhead impurity stream that are recycled to the distillation apparatus; and further steps c) and d).

Description

technical field [0001] The present invention relates to methods and systems for the production of ethylene carbonate and / or ethylene glycol. Background technique [0002] Ethylene glycol is a valuable industrial compound widely used as a starting material for the manufacture of polyester fibers and polyethylene terephthalate (PET) resins. It can also be used in automotive antifreeze and hydraulic brake fluids, aircraft deicers, and pharmaceutical products. [0003] Ethylene glycol is typically produced from ethylene oxide, which in turn is produced by the silver-catalyzed oxidation of ethylene. More specifically, ethylene and oxygen are passed over a silver-based epoxidation catalyst, typically at a pressure of 10-30 bar and a temperature of 200-300°C, resulting in a product stream comprising ethylene oxide, carbon dioxide, ethylene, oxygen and water. [0004] In a well-known process, ethylene oxide is then reacted with a large excess of water in a non-catalytic process to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/38C07C31/20C07C29/12C07C29/74C07C29/80
CPCC07C29/106C07D317/38B01D3/148B01D3/4205Y02P20/10C07C31/202C07C317/38C07C29/76C07C29/80
Inventor J·R·布莱克R·G·H·L·巴斯廷格斯M·A·P·德克斯
Owner SHELL INT RES MAATSCHAPPIJ BV
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