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Preparation of epoxane

A technology of butylene oxide and butanediol, applied in sustainable manufacturing/processing, organic chemistry, climate sustainability, etc., can solve problems such as large amount of wastewater, large investment, and difficult product separation

Active Publication Date: 2021-07-16
昌德新材科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The peroxyacid method and the chlorohydrin method have been gradually restricted and eliminated due to the huge amount of waste water produced; the investment in the production of the co-oxidation method is large; the direct oxidation method of hydrogen peroxide requires the use of methanol as a solvent, due to the boiling point of methanol and butylene oxide Very close, so there are difficulties in product separation

Method used

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  • Preparation of epoxane
  • Preparation of epoxane
  • Preparation of epoxane

Examples

Experimental program
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preparation example Construction

[0027] see figure 1 , is a schematic flow diagram of a method for preparing butylene oxide in an embodiment, and the method for preparing butylene oxide corresponding to the schematic diagram includes the following steps S110 to S150:

[0028] S110. Azeotropic distillation of raw materials containing ethylene glycol (EG) and 1,2-butanediol (BG) with an entrainer to obtain 1,2-butanediol and light components containing ethylene glycol and an entrainer, respectively point.

[0029] In this embodiment, the raw material containing EG and BG is the reaction product of hydrogenation of dimethyl oxalate to ethylene glycol.

[0030] Further, the raw material containing EG and BG is the reaction product of unpurified hydrogenation of dimethyl oxalate to ethylene glycol containing 95% to 99.5% ethylene glycol and 0.5% to 5% 1,2-butanediol ; or the reaction product of ethylene glycol hydrogenation of purified dimethyl oxalate containing 38% to 90% ethylene glycol and 10% to 62% 1,2-but...

Embodiment 1

[0065] The raw material containing 95% ethylene glycol and 5% 1,2-butanediol is azeotropically distilled with cumene to obtain 1,2-butanediol and light components containing ethylene glycol and cumene respectively. Conditions of boiling distillation: top temperature 129°C, kettle temperature 162°C, number of plates 46, absolute pressure 0.1 Bar, molar ratio of cumene to ethylene glycol is 2.1:1.

[0066] 1,2-butanediol and dimethyl carbonate are reacted and rectified under the action of sodium methoxide, light components containing methanol and dimethyl carbonate are extracted from the tower top, and butene carbonate and butylene carbonate are extracted from the bottom of the tower For the heavy component of sodium methoxide, filter the heavy component containing butene carbonate and sodium methoxide to obtain high-purity butylene carbonate. The conditions for reactive distillation are: top temperature 64°C, kettle temperature 100°C, number of plates 50. The absolute pressure ...

Embodiment 2

[0072] The raw material containing 40% ethylene glycol and 60% 1,2-butanediol is azeotropically distilled with ethylbenzene to obtain 1,2-butanediol and light components containing ethylene glycol and ethylbenzene respectively. Distillation conditions: top temperature 145°C, kettle temperature 183°C, number of trays 67, absolute pressure 0.22 Bar, molar ratio of ethylbenzene to ethylene glycol is 1.7:1.

[0073] Reactive distillation of 1,2-butanediol and diethyl carbonate under the action of tetrabutyl titanate, extract light components containing ethanol and diethyl carbonate from the top of the tower, and extract light components containing butyl carbonate from the bottom of the tower The heavy component of enyl ester and tetrabutyl titanate, filter the heavy component containing butylene carbonate and tetrabutyl titanate to obtain high-purity butylene carbonate, and the conditions of reactive distillation are: top temperature 90°C , kettle temperature 130°C, number of plat...

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Abstract

A preparation method of butylene oxide comprises the following steps: azeotropic rectification of a raw material containing ethylene glycol and 1,2-butanediol and an entrainer to obtain 1,2-butanediol and ethylene glycol-containing and co-entraining agent respectively The light component of the boiling agent; 1,2-butanediol and the esterification agent are reacted and rectified under the action of the esterification catalyst to obtain the light component of butylene carbonate and the corresponding reaction product containing the esterification agent; the carbonic acid Butenyl esters are decarboxylated under the action of a decarboxylation catalyst to obtain butylene oxide. The preparation method of above-mentioned butylene oxide, the raw material containing ethylene glycol and 1,2-butanediol and entraining agent azeotropic rectification, form azeotrope by ethylene glycol and entraining agent thereby and 1,2-butanediol Diol purification, the purified 1,2-butanediol is reacted and rectified with an esterification agent to obtain butylene carbonate, and decarboxylation of butylene carbonate can obtain butylene oxide with higher added value.

Description

technical field [0001] The invention relates to the technical field of chemical synthesis, in particular to a preparation method of butylene oxide. Background technique [0002] By the end of 2016, the global ethylene glycol (EG) production capacity reached 37.47 million tons, and the average annual growth rate of production capacity reached more than 5%. At present, there are two main synthesis methods of ethylene glycol, namely: ethylene-ethylene oxide-ethylene glycol route and synthesis gas (hydrogen and carbon monoxide)-ethylene glycol route (commonly known as coal-to-ethylene glycol route). [0003] Because domestic coal resources are abundant, and when the crude oil price is higher than US$55 / barrel, the coal-to-ethylene glycol line shows obvious cost advantages, so this technology has been sought after by domestic companies in recent years. The coal-to-ethylene glycol line mainly includes three units: syngas to dimethyl oxalate, dimethyl oxalate to hydrogenate crude ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/02C07D303/04
CPCC07D301/02C07D303/04Y02P20/10
Inventor 罗小沅蒋卫和杨浴张智肖志强
Owner 昌德新材科技股份有限公司