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Removal method for organic chloride in raffinate generated by petroleum resin separation

A technology of petroleum resin and raffinate, applied in the petroleum industry, processing hydrocarbon oil, hydrocarbon distillation, etc., can solve the problems of high reaction temperature, troublesome recovery, poor economic effect, etc., and achieve good economy and good separation effect. Effect

Inactive Publication Date: 2016-03-23
NINGBO JINHAI CHENGUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a good dechlorination effect and will not block the pipeline; but the service life of the dechlorination agent is short, the reaction temperature is high, and the production cost of the dechlorination agent is high, the recovery is troublesome, and the economic effect is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Send the raffinate to the packed rectification tower, the tower is filled with Pall rings, the raffinate is fed from the middle of the packed tower, and distilled at atmospheric pressure, the temperature at the top of the tower is 40°C, and the temperature at the bottom of the tower is 70°C. Inject ammonia water to control the pH value of the tower still liquid to be 8; the reflux ratio is 1.

[0021] A chlorine-free light component raffinate containing oligomers and unreacted hydrocarbons is obtained at the top of the tower. The chlorine content in the light component raffinate is detected to be 10ppm; the raffinate can be directly sent to the cracking device.

[0022] A heavy component containing chloride was obtained in the tower bottom, and the chlorine content in the tower bottom liquid was 1.24wt%.

[0023] The recovery rate of the light component raffinate was calculated to be 96.5%.

Embodiment 2

[0025] The raffinate is sent to a tray-type rectification tower. The number of theoretical plates in the rectification tower is 30. Continuous rectification is carried out under normal pressure. The tower still is injected with ammonia water for protection. The temperature is 70°C, the tower top temperature is 40°C, and the reflux ratio is 0.5.

[0026] The chlorine content in the light component raffinate at the top of the tower is 12ppm, and the recovery rate of the light component raffinate is 96.8%; the chlorine content in the tower bottom liquid is 1.53wt%.

Embodiment 3

[0028] Tray-type rectification tower, the number of theoretical plates is 30; continuous distillation is carried out under the pressure of 80kPa at the top of the tower, ammonia water is injected into the bottom of the tower for protection, the pH value of the liquid in the bottom of the tower is controlled to be 10, the temperature of the bottom of the tower is 95°C, and the temperature of the top of the tower is controlled at 60°C, the reflux ratio is 0.8.

[0029] The total chlorine content in the light component raffinate at the top of the tower is 7ppm, the chlorine content in the tower bottom liquid is 3.94wt%, and the recovery rate of the light component raffinate is 98.8%.

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Abstract

The invention relates to a removal method for organic chloride in raffinate generated by petroleum resin separation. The method is characterized by including the following steps of sending raffinate to a rectifying tower to be rectified, and controlling the tower kettle temperature of the rectifying tower at 70-110 DEG C, wherein the tower top temperature of the rectifying tower is 50-70 DEG C, the tower top pressure intensity of the rectifying tower is 50-100 kPa, the reflux ratio is 0.5-1.5, the number of tower plates is 10-60, and the PH value of tower kettle liquid is 8-10, raffinate subjected to chloride removal is obtained on the top of the tower, and heavy components containing chloride are obtained in the tower kettle. Compared with the prior art, the method is good in chloride removal effect, the recycle rate of effective substances is high, and the economical efficiency is good.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for removing organic chlorine in a raffinate generated by separating petroleum resin. Background technique [0002] Petroleum resin is widely used in rubber, adhesives, coatings, papermaking, Ink and other industries and fields. [0003] The production of petroleum resin mainly includes cold polymerization and thermal polymerization. Among them, the cold polymerization method uses Lewis acid AlCl 3 As a catalyst, the active component and the catalyst are added to the reactor in proportion to react at a certain reaction temperature. After polymerization, the raffinate generated during the separation of petroleum resin products needs to be sent to the ethylene cracking unit for cracking to produce ethylene. [0004] Due to the use of AlCl 3 As a catalyst, the raffinate inevitably contains chlorides in addition to unreacted monomers. When cracking ethylene in the crac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/00
CPCC10G7/00C10G2300/201
Inventor 熊立群赵全聚竺亚银刘奕
Owner NINGBO JINHAI CHENGUANG CHEM