Propylene recovery method in epoxypropane refining process

A technology of propylene oxide and propylene, which is applied in the field of propylene recovery technology, can solve the problems of non-condensable gas emptying, etc., and achieve the effects of reducing production costs, convenient operation, and reducing the unit consumption of propylene raw materials

Inactive Publication Date: 2016-03-16
SHANDONG BLUSR DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The non-condensable gas at the top of the light component tower is discharged directly into the air by most manufacturers, and some manu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This embodiment is a propylene recovery process in the refining process of propylene oxide. The non-condensable gas at the top of the light removal tower is washed with water, mixed with the gas produced by chlorohydrination, and then compressed and recovered.

[0018] The mass content of propylene at the top of the light removal tower is ≥50%, and the mass content of oxygen is ≤2.0%.

[0019] The washing pressure is 15kPa.

[0020] When washing with water, the water flow rate is 200kg / h.

[0021] The gas pressure resulting from chlorohydrination is 9 kPa.

[0022] The non-condensable gas at the top of the light removal tower is washed with water, mixed with the gas produced by chloroalcoholization, and then transported to the propylene recovery tower for chlorohydrination reaction with chlorine gas to generate chloropropanol, an intermediate product produced from propylene oxide.

Embodiment 2

[0024] This embodiment is a propylene recovery process in the refining process of propylene oxide. The non-condensable gas at the top of the light removal tower is washed with water, mixed with the gas produced by chlorohydrination, and then compressed and recovered.

[0025] The mass content of propylene at the top of the light removal tower is ≥60%, and the mass content of oxygen is ≤2.0%.

[0026] The washing pressure is 10kPa.

[0027] When washing with water, the water flow rate is 250kg / h.

[0028] The gas pressure resulting from chlorohydrination is 6 kPa.

[0029] The non-condensable gas at the top of the light removal tower is washed with water, mixed with the gas produced by chloroalcoholization, and then transported to the propylene recovery tower for chlorohydrination reaction with chlorine gas to generate chloropropanol, an intermediate product produced from propylene oxide.

Embodiment 3

[0031] This embodiment is a propylene recovery process in the refining process of propylene oxide. The non-condensable gas at the top of the light removal tower is washed with water, mixed with the gas produced by chlorohydrination, and then compressed and recovered.

[0032] The mass content of propylene at the top of the light removal tower is ≥80%, and the mass content of oxygen is ≤2.0%.

[0033] The washing pressure is 10kPa.

[0034] When washing with water, the water flow rate is 150kg / h.

[0035] The gas pressure resulting from chlorohydrination is 7 kPa.

[0036] The non-condensable gas at the top of the light removal tower is washed with water, mixed with the gas produced by chloroalcoholization, and then transported to the propylene recovery tower for chlorohydrination reaction with chlorine gas to generate chloropropanol, an intermediate product produced from propylene oxide.

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PUM

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Abstract

The invention relates to a propylene recovery method in epoxypropane refining process. In the propylene recovery method, non-condensable gas obtained from the tower top of a light-fraction removing tower is washed with water, and is mixed with gas generated in chlorohydrination, and an obtained mixture is subjected to pressure recovery. The propylene recovery method is simple, and is convenient in operation; the tower top gas of the light-fraction removing tower is introduced into chlorohydrination treatment for recovery, propylene raw material unit consumption of epoxypropane equipment is reduced, and production cost of epoxypropane is reduced.

Description

technical field [0001] The invention relates to a process for recovering propylene in the process of refining propylene oxide. Background technique [0002] At present, more than 60% of domestic propylene oxide plants adopt the chlorohydrinization method, but the chlorohydrin method contains more impurities in propylene oxide, and most of the light components are propylene. Most of the propylene oxide refining process adopts a two-tower process or a three-tower process. No matter which form the first column is a light component column, the purpose is to remove the light component low boilers. The non-condensable gas at the top of the light component column is discharged directly into the air by most manufacturers, and some manufacturers recover and condense it for a second time through saponification negative pressure, but the non-condensable gas is still discharged. Recovering this part of propylene in non-condensable gas will effectively reduce the unit consumption of pro...

Claims

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Application Information

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IPC IPC(8): C07C31/36C07C29/64
CPCC07C29/64C07C31/36
Inventor 郭辉荆锋谭好富
Owner SHANDONG BLUSR DONGDA CHEM
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