Epoxypropane purifying method

A technology of propylene oxide and purification method, which is applied in the direction of organic chemistry, can solve the problems of poor product quality and high cost of extraction agent, and achieve the effect of reducing cycle accumulation

Inactive Publication Date: 2014-10-22
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 that due to the introduction of the medium outside the system in the prior art, there are problems of high cost of extractant and poor product quality, and a new method for purifying propylene oxide is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] use figure 1 Process shown, containing water, acetaldehyde, propionaldehyde, methanol, acetone, C 5 ~C 7 The composition of stream 1 (crude propylene oxide solution) of impurities such as hydrocarbons is shown in Table 4.

[0038] Table 4

[0039] composition Content, wt acetone 0.008 Propionaldehyde 0.002 Acetaldehyde 0.001 Propylene oxide 0.987 water 0.001 C 5 ~C 7 Hydrocarbons 0.001

[0040] Stream 1 is fed from the lower part of T101 tower with a flow rate of 10000kg / h. Stream 3 (T101 tower bottom liquid) mainly contains water, propionaldehyde, acetone, C 7 Hydrocarbons, to the outside of the system, stream 2 (T101 overhead distillate) is pumped to 400 kPa and fed from the lower part of T102 tower. The theoretical plate number of T101 column is 50, the feed plate position is the 32nd plate, the operating pressure is controlled at 150kPa, and the reflux ratio is 2.6.

[0041] Stream 4 (T103 kettle liquid) is...

Embodiment 2

[0050] use figure 1 Process shown, containing water, acetaldehyde, propionaldehyde, methanol, acetone, C 5 ~C 7 The composition of stream 1 (crude propylene oxide solution) of impurities such as hydrocarbons is shown in Table 6.

[0051] Table 6

[0052] composition Content, wt acetone 0.008 Propionaldehyde 0.002 Acetaldehyde 0.001 Propylene oxide 0.987 water 0.001 C 5 ~C 7 Hydrocarbons 0.001

[0053] Stream 1 is fed from the lower part of T101 tower with a flow rate of 10000kg / h. Stream 3 (T101 tower bottom liquid) mainly contains water, propionaldehyde, acetone, C 7 Hydrocarbons, to the outside of the system, stream 2 (T101 overhead distillate) is pumped to 400 kPa and fed from the lower part of T102 tower. The theoretical plate number of T101 column is 55, the feed plate position is the 34th plate, the operating pressure is controlled at 160kPa, and the reflux ratio is 2.5.

[0054] Stream 4 (T103 kettle liquid) is...

Embodiment 3

[0063] use figure 1 Process shown, containing water, acetaldehyde, propionaldehyde, methanol, acetone, C 5 ~C 7 The composition of stream 1 (crude propylene oxide solution) of impurities such as hydrocarbons is shown in Table 8.

[0064] Table 8

[0065] composition Content, wt acetone 0.009 Propionaldehyde 0.003 Acetaldehyde 0.002 Propylene oxide 0.982 water 0.002 C 5 ~C 7 Hydrocarbons 0.002

[0066] Stream 1 is fed from the lower part of T101 tower with a flow rate of 10000kg / h. Stream 3 (T101 tower bottom liquid) mainly contains water, propionaldehyde, acetone, C 7 Hydrocarbons, to the outside of the system, stream 2 (T101 overhead distillate) is pumped to 400 kPa and fed from the lower part of T102 tower. The theoretical plate number of T101 column is 58, the feeding plate position is the 35th plate, the operating pressure is controlled at 160kPa, and the reflux ratio is 2.4.

[0067] Stream 4 (T103 kettle liquid)...

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Abstract

The invention relates to an epoxypropane purifying method. The problems of high extractant cost and bad product quality due to the introduction of a system outside medium in the prior art are mainly solved. The epoxypropane purifying method is characterized in that a crude epoxypropane solution containing epoxypropane, water, acetaldehyde, propionaldehyde, methanol, acetone and C5C7 hydrocarbon impurities and obtained after a reaction of cumene hydroperoxide and propylene is extracted and distilled by an extractant, wherein the extractant is isopropyl benzene. The epoxypropane purifying method well solves the problems, and can be used in the industrial production of epoxypropane purification.

Description

technical field [0001] The invention relates to a method for purifying propylene oxide. Background technique [0002] Propylene oxide is an important organic compound raw material and the third largest propylene derivative after polypropylene and acrylonitrile. Propylene oxide is mainly used in the production of polyether polyols, propylene glycol and various nonionic surfactants, among which polyether polyols are important raw materials for the production of polyurethane foams, insulation materials, elastomers, adhesives and coatings, etc. Ionic 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 polymerization of propylene oxide not only require the purity of propylene oxide to reach 99.9...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07D301/32
CPCC07D303/04C07D301/32
Inventor 胡松杨卫胜陈伟
Owner CHINA PETROLEUM & CHEM CORP
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