Method of rectifying and refining epoxypropane through reaction

A technology of propylene oxide and reactive distillation, applied in the direction of sustainable manufacturing/processing, chemical industry, climate sustainability, etc., can solve problems such as high energy consumption, achieve low equipment investment and operation energy consumption, high-efficiency removal, The effect of high process integration

Inactive Publication Date: 2018-02-13
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has high dealdehyde efficiency, and can solve the problem of high energy consumption caused by rectification and recovery of extractant during traditional extraction and rectification dealdehyde, and is a high-efficiency propylene oxide refining process

Method used

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  • Method of rectifying and refining epoxypropane through reaction
  • Method of rectifying and refining epoxypropane through reaction
  • Method of rectifying and refining epoxypropane through reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In the experiment, a small-scale rectification column with an inner diameter of 20mm, a height of 2500mm, and a 1.5x1.5mm triangular spiral packing was used, and the number of theoretical plates was about 65. The measured composition of crude PO raw materials in the experiment is shown in Table 3 below. The small test feed rate is 2ml / min, the feed position is 1000mm from the top of the tower, the top pressure is maintained at 160kPa, the reflux ratio is 2.5, and the recovery rate at the top of the tower is 0.992. The reaction entrainer is aniline, the molar ratio of it to the crude PO feed is 0.0015, and the feed position is 1550 mm from the top of the tower. Under this condition, the temperature of the tower bottom was 102° C., and the composition of the overhead liquid was shown in Table 3 below. Based on this calculation, the PO recovery rate in the small test experiment was 99.59%, and the total removal rate of aldehyde impurities was 63.90%, among which the remova...

Embodiment 2、3

[0040] Except for the reaction entrainer, other experimental conditions were the same as in Example 1. The reaction entrainer of embodiment 2,3 is respectively phenylhydrazine, semicarbazide, and experimental result is as shown in table 4, and small test experiment PO recovery rate is respectively 99.61%, 99.61%, and total aldehyde removal rate is respectively 82.35%, 81.08% %, the removal rates of formaldehyde were 99.25%, 99.16%, and the removal rates of propionaldehyde were 99.64%, 99.61%.

[0041] Table 4 Embodiment 2~5 overhead liquid composition

[0042]

Embodiment 4

[0044] The height of the experimental rectification tower is 1900 mm, the number of theoretical plates is about 50, the distance between the feed plate of crude PO and reaction entrainer is 750 mm and 1350 mm respectively from the top of the tower, and other conditions are the same as in Example 2. The experimental results of the overhead distillate composition are shown in Table 5 below. From this, the PO recovery rate of the small test experiment is calculated to be 99.57%, and the total removal rate of aldehyde impurities is 72.44%, wherein the formaldehyde removal rate is 98.28%, and the propionaldehyde removal rate is 99.57%. The removal rate is 98.80%.

[0045] Table 5 Example 4 overhead distillate composition

[0046]

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PUM

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Abstract

The invention discloses a method of rectifying and refining epoxypropane through a reaction. The method comprises the following steps: performing reactive distillation of to-be-refined crude epoxypropane containing aldehyde impurities and a reaction entrainer, wherein the reaction entrainer is one or more of phenylamine, phenylhydrazine and semi carbazide, preferably phenylhydrazine and semi carbazide, and most preferably phenylhydrazine. The method disclosed by the invention has relatively high aldehyde removal efficiency, can solve the problem of high energy consumption caused by rectifyingand recycling an extraction agent in traditional extraction and rectification for aldehyde removal, and is a novel efficient epoxypropane refining technology.

Description

technical field [0001] The invention relates to a method for refining propylene oxide through reactive distillation, especially a method for removing aldehyde impurities from crude PO produced by a co-oxidation method. Background technique [0002] Propylene oxide is an important basic chemical raw material. It is the third largest organic chemical product in the production of propylene derivatives after polypropylene and acrylonitrile. It is mainly used in the production of polyether and propylene glycol. Propylene oxide production processes mainly include chlorohydrin method, co-oxidation method and direct oxidation method. Among them, the main problems of the chlorohydrin method include serious equipment corrosion, a lot of waste water and waste residue, and the process is gradually eliminated. The direct oxidation method is a propylene oxide production process using hydrogen peroxide as the oxidant. The main advantage of the process is that there are no co-products. The...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/32
CPCC07D301/32C07D303/04Y02P20/10
Inventor 叶建初王磊董岩峰常林高学顺虞根海张宏科华卫琦
Owner WANHUA CHEM GRP CO LTD
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