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Purification process for epoxypropane

A technology of propylene oxide and purification method, applied in the direction of organic chemistry, etc., can solve the problems that propylene oxide cannot be produced, polyether polyol polyether polyol quality is unqualified, etc.

Inactive Publication Date: 2009-05-27
TIANJIN DAGU CHEM CO LTD +1
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AI Technical Summary

Problems solved by technology

[0004] Propylene oxide is mainly used to produce polyether polyols. When propylene oxide contains a certain amount of acetaldehyde, propylene oxide cannot produce polyether polyols or the quality of polyether polyols produced is unqualified.

Method used

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Embodiment 1

[0029] Under the action of titanium-silicon molecular sieve catalyst, propylene and hydrogen peroxide react in methanol solution to form dilute propylene oxide solution, and the solution is removed through one or more steps to remove propylene and unreacted hydrogen peroxide contained in it, and the reaction extract is obtained. The crude propylene oxide used for distillation is shown in Table 1.

[0030] Table 1 Components of crude propylene oxide

[0031] name components Propylene oxide 49％ Acetaldehyde 0.7％

[0032] The crude propylene oxide and the 15% sulfur-containing compound solution containing the feed liquid content shown in Table 1 are mixed by a static mixer and then enter the reactor for reaction for 30 minutes, and then enter the rectification column, at a reflux ratio of 3.5, at an absolute pressure Operate under the operating pressure of 0.16MPa, the number of theoretical plates of the tower is 40 theoretical plates, enter crude prop...

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PUM

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Abstract

The invention discloses a method for purifying epoxy propane. Aldehyde in the epoxy propane is separated through the continuous operation of a reactor and a rectifying tower, a titanium-silicate molecular sieve is used as a catalyst, methanol is used as a solvent, propylene and hydrogen peroxide are taken as raw materials for an epoxidation reaction, and then crude epoxy propane is obtained through one-step or multi-step treatment. The crude epoxy propane and a sulfur-containing compound solution are mixed through a static mixer, then enter the reactor to react for certain time, and enter the rectifying tower for refinement, and the retention time of a mixed solution of the crude epoxy propane and the sulfur-containing compound solution in the reactor is between 5min and 1h. The method has the advantages that after the crude epoxy propane is purified by the method, the aldehyde content of the obtained crude epoxy propane is lower than 100ppm, thereby achieving good effect.

Description

Technical field [0001] The invention relates to a method for purifying propylene oxide, in particular to a method for separating acetaldehyde in propylene oxide through continuous operation of a reactor and a rectifying tower. Background technique [0002] Under the action of a catalyst, propylene and hydrogen peroxide react in a methanol solution to form a dilute propylene oxide solution, and the solution undergoes one or more steps to remove propylene and unreacted hydrogen peroxide contained in it, and obtain the crude epoxy to be used In propane, acetaldehyde is higher than 500ppm. [0003] After simple rectification, the purity of propylene oxide reaches more than 98%, but because acetaldehyde has a boiling point temperature close to that of propylene oxide and a similar relative volatility, so the method of rectification is used to further improve the purity of propylene oxide Almost impossible. [0004] Propylene oxide is mainly used to produce polyether polyols. Wh...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/12C07D301/32
Inventor 肖卫国沈本贤张策王华伟王雷张珍妹赵基钢
Owner TIANJIN DAGU CHEM CO LTD
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