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Regeneration process for solid acid catalyst

A solid acid catalyst, regeneration temperature technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of large consumption of eluent, long elution time, poor catalyst regeneration ability, etc. problems, to achieve the effect of less dosage, short elution time and strong regeneration ability

Inactive Publication Date: 2004-08-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the three catalyst regeneration methods mentioned above, the eluent carries a small amount of deactivated sediment, resulting in large consumption of eluent and long elution time
The eluent has poor ability to regenerate the catalyst, and the catalyst needs to be regenerated frequently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Linear alkylbenzenes are synthesized from benzene and linear olefins, and the reaction is carried out in a tubular reactor. The material of the reactor is ordinary carbon steel. The lower end of the reactor is the inlet, and the upper end is the outlet. The reactor is 400 mm long, with an outer diameter of 21 mm and an inner diameter of 14 mm. The axis of the tubular reactor has a thermocouple tube with a diameter of 3mm. The thermocouple can move axially in the tubular reactor to determine the constant temperature section of the reactor. Both reaction temperature and reaction pressure can be controlled automatically.

[0014] 10.0 grams of loaded heteropolyacid catalyst (HPA (40%) / SiO 2 ). The particle size of the catalyst is 40-60 mesh. The activation process of the catalyst is as follows: dry compressed air at atmospheric pressure passes through the reactor at a flow rate of 200ml / hr, then the temperature of the reactor is raised and kept at 200°C, the temperat...

Embodiment 2

[0032] Reaction conditions and raw material composition are the same as Example 1, and the reaction time is extended to 144 hours by 72 hours of last example. After 144 hours of reaction, the bromine index of the reactor outlet material was 153.86 mgBr, and the conversion rate was 96.4%. After 144 hours of reaction, the temperature of the reactor was lowered to 100° C., and the reaction raw material was switched to dehydrated dichloromethane eluent. After 48 hours of elution, the temperature of the reactor was raised to 135° C., and the reaction material was passed through for reaction. After reacting for 5 hours, the bromine index of the outlet material was 15.24 mgBr, and the conversion rate was 99.6%. After 144 hours of reaction, the bromine index of the outlet material was 170.05 mgBr, and the conversion rate was 96.0%. Then reduce the reactor temperature to 100°C, at a pressure of 1.0MPa, and a space velocity of 2hr -1The eluent was eluted with dichloromethane for 48 h...

Embodiment 3

[0034] Reaction conditions and raw material composition are the same as Example 1, and the reaction time is shortened from 72 hours in Example 1 to 20 hours, and then dehydrated dichloromethane is eluted for 4 hours. The reactions were performed in this order. The net reaction time of the catalyst was 300 hours. The bromine index of the exported material is lower than 60.0mgBr, and the conversion rate is higher than 98.6%. The amount of raw material treated per gram of catalyst was 608 milliliters. The operating period is 24 hours, and the elution ratio is 0.2.

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Abstract

The regeneration process of solid acid catalyst includes making the eluant containing alkyl halide or arane halide contact with solid acid catalyst to be regenerated and subsequent separation of the eluant, and the regeneration process has the temperature of 50-200 deg.c, pressure of 0.1-4.5 MPa, liquid phase volume space velocity of the eluant 0.1-20 and elution time of 1-48 hr. The solid acid catalyst is selected from loaded heteropolyacid and its salt, loaded inorganic acid and its salt, acid oxide and zeolite molecular sieve, cationic exchange resin and solid superstrong acid. The present invention regenerates solid acid catalyst with alkyl halide as eluant, and has less consumption of eluant, short elution period and powerful regeneration capacity to deactivated catalyst.

Description

technical field [0001] The invention relates to a regeneration method of a solid acid catalyst. technical background [0002] Protic acids (such as hydrofluoric acid, sulfuric acid) and Lewis acids (AlCl 3 etc.) are widely used as catalysts in the chemical industry. However, due to the strong corrosiveness or toxicity of these catalysts, the problems of equipment corrosion and environmental pollution are prominent, and pose potential hazards to the safety of operators. In recent years, the research on replacing traditional liquid acid catalysts with solid acid catalysts has made great progress, and some have been industrialized. The solid acid catalyst has the advantages of weak corrosion to equipment, slight environmental pollution and simple separation operation. However, these solid acid catalysts have poor stability and are easily deactivated during use. How to solve the regeneration of deactivated catalysts is the key to replace liquid acid catalysts with solid acid ...

Claims

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Application Information

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IPC IPC(8): B01J27/28
Inventor 赵福军温朗友闵恩泽
Owner CHINA PETROLEUM & CHEM CORP
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