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Purifying apparatus for epoxypropane

A technology of propylene oxide and purification device, applied in the direction of organic chemistry, etc., can solve the problems of low concentration, waste of materials, high cost of extraction agent, and achieve the effect of reducing process energy consumption and improving technical effect.

Active Publication Date: 2017-02-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the high cost of the extractant due to the introduction of the medium outside the system in the prior art, and the failure to take into account the recovery of methanol, or the recovered methanol cannot be recycled due to the low concentration, resulting in waste of materials. Provide A new purification device for propylene oxide

Method used

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  • Purifying apparatus for epoxypropane
  • Purifying apparatus for epoxypropane
  • Purifying apparatus for epoxypropane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] use figure 1 The composition of crude propylene oxide containing water, methanol, acetaldehyde, acetone, and methyl formate impurities in the shown device is shown in Table 1.

[0031] Table 1

[0032] composition weight content Methanol 0.26 Acetaldehyde 0.006 acetone 0.01 Methyl formate 0.01 water 0.01 other 0.004 Propylene oxide 0.7

[0033]The flow rate of crude propylene oxide 1 is 10000kg / h, reacts with stream 2 sodium hydroxide solution in the first mixer M1, methyl formate undergoes saponification reaction to produce methanol and sodium formate, and the reacted solution and stream 3 hydrazine solution are in the second mixer In the M2 reaction, carbonyl compounds such as acetaldehyde and acetone are reduced to produce hydrazone heavy components and water. After the reaction, the solution enters the upper part of the T1 tower. The number of theoretical plates in the T1 column is 40, the feeding position ...

Embodiment 2

[0039] use figure 1 In the shown device, the composition of crude propylene oxide (stream 1) containing impurities such as methanol, acetaldehyde, acetone, methyl formate and water is shown in Table 3.

[0040] table 3

[0041] composition weight content Methanol 0.16 Acetaldehyde 0.008 acetone 0.007 Methyl formate 0.011 water 0.009 Propylene oxide 0.8

[0042] The flow rate of stream 1 is 10000kg / h, react with stream 2 sodium hydroxide solution in mixer M1, decompose methyl formate into methanol and sodium formate, react the solution with stream 3 hydrazine solution in mixer M2, and mix acetaldehyde, acetone The carbonyl compounds are reduced to produce hydrazone heavy components and water. After the reaction, the solution enters the upper part of the T1 tower. The theoretical plate number of the T1 column is 50, the feeding position is the 36th plate, the operating pressure is controlled at 80kPa, the reflux ratio is 6, t...

Embodiment 3

[0048] use figure 1 For the shown device, the composition of the crude propylene oxide solution (stream 1) containing impurities such as methanol, acetaldehyde, acetone, methyl formate and water is shown in Table 5.

[0049] table 5

[0050] composition weight content Methanol 0.07 Acetaldehyde 0.005 acetone 0.007 Methyl formate 0.006 water 0.01 Propylene oxide 0.9

[0051] The flow rate of stream 1 is 10000kg / h, react with stream 2 sodium hydroxide solution in mixer M1, decompose methyl formate into methanol and sodium formate, react the solution with stream 3 hydrazine solution in mixer M2, and mix acetaldehyde, acetone The carbonyl compounds are reduced to produce hydrazone heavy components and water. After the reaction, the solution enters the upper part of the T1 tower. The theoretical plate number of the T1 column is 60, the feeding position is the 45th plate, the operating pressure is controlled at 90kPa, the reflux ...

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Abstract

The invention relates to a purifying apparatus for epoxypropane. The purifying apparatus mainly overcomes the problems of high cost of an extractant due to introduction of a medium out of a system and incapability of recovery of methanol or material waste resulting from incapable recycling of recovered methanol due to low concentration of recovered methanol in the prior art. The purifying apparatus comprises a) a first mixer used for allowing crude epoxypropane containing impurities to contact with aqueous alkali so as to obtain first material flow; b) a second mixer used for allowing the first material flow to contact with hydrazine hydrate so as to obtain second material flow; c) a low-pressure rectifying tower used for separating the second material flow, wherein third material flow is obtained at the top of the rectifying tower, recovered methanol material flow is obtained at the side line of the tower, and a heavy-component material flow is obtained at the bottom of the tower; and d) a high-pressure rectifying tower used for separating the third material flow, wherein fourth material flow is obtained at the top of the rectifying tower and cyclically returns to the low-pressure rectifying tower, and an epoxypropane product is obtained at the bottom of the tower. Thus, the purifying apparatus overcomes the above problems and can be used for industrial purification of epoxypropane.

Description

technical field [0001] The invention relates to a propylene oxide purification device, in particular to a crude propylene oxide purification device containing water, methanol, acetaldehyde, acetone, methyl formate and other impurities produced by hydrogen peroxide direct oxidation (HPPO). Background technique [0002] Propylene oxide is an important organic compound raw material, mainly used in the production of polyether polyol, propylene glycol and various nonionic surfactants, among which polyether polyol is used in the production of polyurethane foam, insulation materials, elastomers, adhesives and coatings, etc. Various nonionic surfactants are widely used in petroleum, chemical, pesticide, textile, daily chemical and other industries. However, only propylene oxide with higher purity can be used to manufacture polypolyols, so the crude propylene oxide product can be purified before it can be used in the preparation of polypolyols. The conditions required for the polyme...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/32
CPCC07D301/32C07D303/04
Inventor 胡松杨卫胜李木金
Owner CHINA PETROLEUM & CHEM CORP
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