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Prepn of sulfurless benzene with pyrolytic light benzol

A technology of coking benzene and sulfur-free benzene, which is applied in extraction and purification/separation, adsorption purification/separation, bulk chemical production, etc. It can solve problems such as equipment corrosion, environmental pollution, waste of thiophene resources, etc., and achieve mild desulfurization conditions, The process is simple and the effect of equipment corrosion is small

Inactive Publication Date: 2006-04-19
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its complex composition and high sulfur content, its comprehensive development and utilization are largely restricted, especially in the field of catalysis. For a long time, the deep processing and utilization of this coking by-product has not been greatly developed.
my country's coking light benzene accounts for 40-50% of the benzene output. It is an important raw material for fine chemical intermediates and local organic chemicals. Removal of sulfides in light benzene is the key to the rational development of this resource. At present, except for large-tonnage coking light benzene treatment In addition to catalytic hydrogenation, the vast majority of small and medium-sized enterprises in my country still use the traditional pickling method. The method is simple and easy to implement, but the corrosion of equipment is very serious, and regenerated acid that is difficult to handle is produced, causing great environmental pollution and causing thiophene resources. Waste and loss of benzene lead to high unit consumption of coking light benzene and low benefit. Therefore, a better method has not been found so far to prepare coking light benzene into sulfur-free benzene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] With coking light benzene (containing 12.4% toluene, 0.5% dimethylbenzene) that contains 4063mg / L thiophene as raw material, dimethyl formamide is extraction agent, and the actual plate number of rectifying column is 45, and solvent ratio is 2.67 (being that The ratio of the volume flow rate of the extractant to the coking light benzene of the raw material), under the condition that the reflux ratio is 4:1, the temperature at the top of the tower is controlled at 78--80°C, and the temperature at the bottom of the tower is 140--145°C, then the extractive distillation The concentration of thiophene in coked benzene in the overhead fraction decreased to about 22.5mg / L, and the removal rate of thiophene was 99.51%. The bottom liquid of the tower is pumped out into the solvent recovery tower, and the thiophene concentrate is obtained at the top of the recovery tower. The top fraction of the extractive distillation tower is washed with water, dried with anhydrous calcium chlor...

Embodiment 2

[0014] Using coking light benzene containing 15030mg / L thiophene as raw material, dimethylformamide as extractant, the actual number of plates in the rectification column is 45, the solvent ratio is 2.33, and the reflux ratio is 4:1. If the temperature is 78--80°C and the temperature of the tower bottom is 140--145°C, the concentration of thiophene in the benzene in the overhead fraction of the extractive distillation tower will drop to 49.1mg / L, and the removal rate of thiophene will be 99.67%. The overhead fraction will be washed with water , Anhydrous calcium chloride dried and then SiO 2 -CuZSM-5 is selectively adsorbed to remove residual thiophene and obtain sulfur-free benzene. The liquid in the bottom of the tower is pumped out into the solvent recovery tower, and the thiophene concentrate is obtained at the top of the recovery tower.

Embodiment 3

[0016] Using transition metal ion-exchanged and surface silanized SiO 2 -RECuZSM-5 zeolite molecular sieve is used as adsorbent, under normal pressure, adsorption temperature is 50℃, space velocity WHSV=1.0hr -1 , coking benzene with the overhead fraction of extractive distillation (after washing with water, use anhydrous CaCl 2 Drying and dehydration treatment, containing 22.5mg / L thiophene) as raw material, the adsorption results show that there is no thiophene sulfur in the product benzene, and the adsorption bed breakthrough time reaches 79 hours. The saturated adsorbent can be regenerated under 350°C hot nitrogen purge.

[0017] The coking light benzene used in the above three examples has a distillation range of 75 to 150°C.

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Abstract

The present invention relates to the preparation process of benzene from pyrolytic light benzol. The present invention adopts combined extracting rectification and zeolite molecular sieve adsorption process. Compared with traditional acid pickling process and catalytic hydrorefining process, the process of the present invention has simple technological process, less corrosion to equipment, low cost and high yield and can obtain expensive thiophen product. The present invention is one better process for iron and steel enterprise and coking enterprise to deep processing and utilize side product.

Description

technical field [0001] The present invention relates to the deep processing and utilization of the by-products produced in the industrial production process of iron and steel enterprises and coking enterprises, in particular, it relates to a method for preparing sulfur-free benzene by using coking light benzene as raw material through extractive distillation and molecular sieve selective adsorption . Background technique [0002] Coking light benzene is a by-product of iron and steel enterprises and coking enterprises, and it is also a valuable resource for the development of organic and fine chemicals. However, due to its complex composition and high sulfur content, its comprehensive development and utilization are largely restricted, especially in the field of catalysis. For a long time, the deep processing and utilization of this coking by-product has not been greatly developed. my country's coking light benzene accounts for 40-50% of the benzene output. It is an importa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/04C07C7/10C07C7/13A62D3/00
CPCY02P20/52
Inventor 罗国华徐新杨春育
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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