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Preparation method of epoxypropane

A technology of propylene oxide and epoxidation reaction, which is applied in the fields of organic chemistry and bulk chemical production, and can solve problems such as the difficulty in obtaining high-purity propylene oxide and the inability to effectively separate propylene oxide and methanol

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that the existing method for preparing propylene oxide cannot effectively separate propylene oxide and methanol, thereby making it difficult to obtain high-purity propylene oxide, and provide a new method for preparing propylene oxide , the method can prepare higher purity propylene oxide

Method used

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  • Preparation method of epoxypropane
  • Preparation method of epoxypropane

Examples

Experimental program
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preparation example Construction

[0013] The preparation method of described propylene oxide provided by the invention comprises the following steps:

[0014] (1) Under the propylene epoxidation reaction conditions, in the presence of a solid catalyst, make the mixed material containing methanol, propylene and hydrogen peroxide pass through the first reactor and the second reactor successively;

[0015] (2) under the first azeotropic rectification condition, the propylene oxide crude product obtained in step (1) is sent in the first azeotropic rectification tower, and this first azeotropic rectification condition makes propylene oxide and Part of the methanol is extracted from the top of the tower in the form of azeotrope, and the remaining part of the methanol is extracted from the bottom of the tower, and the content of propylene oxide in the bottom effluent of the first azeotropic rectification tower is not higher than 5% by weight;

[0016] (3) Under the second azeotropic rectification condition, the azeot...

Embodiment approach

[0032] According to another embodiment of the present invention, the first azeotropic distillation conditions may also include that the bottom temperature of the first azeotropic distillation column is 100-140°C, preferably 100-130°C; the reflux ratio is 2 -5:1. The second azeotropic distillation conditions may also include that the bottom temperature of the second azeotropic distillation column is 110-130° C., preferably 110-120° C.; the reflux ratio is 0.8-3:1.

[0033] In the present invention, the first azeotropic rectification tower and the second azeotropic rectification tower can each be a packed tower, a tray tower or a composite tower of packing and trays.

[0034] The packing packed in the described packed tower can be various packings known to those skilled in the art, for example this packing can be selected from Raschig ring, Pall ring, stepped ring, saddle ring, arc saddle type, rectangular saddle type, One or more of θ mesh ring, calendered hole ring, plate cor...

preparation example 1

[0043] Preparation Example 1: Preparation of Ti-Si Molecular Sieve Catalyst

[0044] 100 grams of titanium-silicon molecular sieve powder (purchased from Hunan Jianchang Co., Ltd., brand HTS), 1 gram of magnesium oxide and 40 grams of tetramethoxysilane are mixed uniformly, and then 20 grams of silica sol (SiO 2 The content is 30% by weight), 2 grams of polyvinyl alcohol, 1 gram of Sesame powder (purchased from Dongming County Zhuwa Tianjing Glue Factory) and 20 milliliters of water, mixed evenly and extruded into strips, the size is 2× 2 mm, and then dried at 70°C for 4 hours to obtain molding A.

[0045]Take 100 grams of molding A and put it into a three-necked bottle, add 200ml of 20% by weight sodium hydroxide solution, heat to 90°C and keep it warm for 6 hours, then wash with deionized water until the washing water does not contain sodium ions until. Then, it was dried at 120°C for 3 hours, and fired at 550°C for 3 hours to obtain a fired product B.

[0046] Get 100 gr...

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Abstract

The invention discloses a preparation method of epoxypropane. The method comprises the following steps of: firstly, under the condition of an epoxidation reaction of propylene and in the presence of a solid catalyst, enabling a mixed material containing methanol, the propylene and hydrogen peroxide to sequentially pass through a first reactor and a second reactor; secondly, under a first azeotropic distillation condition, feeding an epoxypropane crude product obtained in the first step into a first azeotropic distillation tower; and thirdly, under a second azeotropic distillation condition, feeding an azeotropic mixture extracted from the top of the first azeotropic distillation tower into a second azeotropic distillation tower and enabling an azeotropic mixture extracted from the top of the second azeotropic distillation tower to return to the interior of the first azeotropic distillation tower. The high-purity epoxypropane can be prepared by adopting the method for epoxidizing the propylene, which is provided by the invention; in addition, high conversion rate of the hydrogen peroxide and high selectivity of the epoxypropane are obtained.

Description

technical field [0001] The invention relates to a preparation method of propylene oxide. Background technique [0002] At present, propylene oxide is mainly produced by chlorohydrin method and co-oxidation method in the world. The chlorohydrin method will be phased out gradually due to the pollution problem; while the co-oxidation method is restricted by the application of by-product outlets, and it is impossible to obtain large-scale development. Therefore, the production method of propylene oxide of prior art all seriously restricts the production of propylene oxide. In recent years, a new method for preparing propylene oxide has emerged. Under the catalysis of titanium-silicon molecular sieve, propylene oxide is synthesized by epoxidation of propylene with oxidant hydrogen peroxide. The method has the advantages of mild conditions, environmental friendliness and no pollution, and becomes a green new process for producing propylene oxide. [0003] The epoxidation of pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07D301/12C07D301/32
CPCY02P20/52
Inventor 王伟伍小驹李华林民何驰剑高计皂佘喜春
Owner CHINA PETROLEUM & CHEM CORP
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