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Deep desulfurization technology of refinery liquefied petroleum gas

A liquefied petroleum gas, deep desulfurization technology, applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of unfavorable deep processing, etc., and achieve the effect of improving quality, increasing processing depth, and maximizing economic benefits

Inactive Publication Date: 2014-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology needs to add H2O2 as an oxidant while desulfurization, effectively removes dimethyl disulfide and introduces new impurities, which is not conducive to subsequent deep processing

Method used

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  • Deep desulfurization technology of refinery liquefied petroleum gas
  • Deep desulfurization technology of refinery liquefied petroleum gas
  • Deep desulfurization technology of refinery liquefied petroleum gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Collected from catalytic cracking liquid hydrocarbons in a refinery, after dehydration by 3A molecular sieve, the total sulfur is 75mg / m3, including disulfide 53mg / m3, COS 21mg / m3, and other sulfide 1mg / m3. A single-column desulfurization simulation experiment was carried out with mixed packing of carbonyl sulfide and disulfide removal adsorbents. The decarbonyl sulfide adsorbent is packed in the lower layer of the desulfurization column with a loading volume of 50mL; the disulfide removal adsorbent is packed in the upper layer of the desulfurization column with a loading volume of 150mL, the liquid hydrocarbon flow rate is 100mL / h, the test temperature is 40°C, and the test pressure is 1.4MPa. 400 hours before the test run, no sulfide was detected at the outlet; after 500 hours of operation, the total outlet sulfur was 2mg / m3, of which disulfide was 1.3mg / m3, COS was 0.5mg / m3, and other sulfides were 0.2mg / m3; after 800 hours of operation, the total outlet Sulfur 3.5mg...

Embodiment 2

[0040] Collected from the carbon four components of a refinery gas separation unit, after dehydration by 3A molecular sieve, the total sulfur is 35mg / m3, of which disulfide is 22mg / m3, COS is 10.8mg / m3, and other sulfide is 1.2mg / m3. A single-column desulfurization simulation experiment was carried out with mixed packing of carbonyl sulfide and disulfide removal adsorbents. The decarbonylsulfide adsorbent is packed in the lower layer of the desulfurization column, with a loading volume of 40mL; the disulfide removal adsorbent is loaded in the upper layer of the desulfurization column, with a loading volume of 120mL, the liquid hydrocarbon flow rate is 80mL / h, the test temperature is 30°C, and the test pressure is 1.2MPa. 500 hours before the test operation, no sulfide was detected at the outlet; after 600 hours of operation, the total sulfur at the outlet was 1.5mg / m3, of which disulfide was 1.1mg / m3, COS was 0.1mg / m3, and other sulfides were 0.3mg / m3; after 900 hours of operat...

Embodiment 3

[0042] On-site sideline test in a coking workshop of a refinery, the total sulfur of liquid hydrocarbons is 150~450mg / m3, and a 3A molecular sieve dehydration tank is added before the liquid hydrocarbons enter the desulfurization tank. The sulfide tank and the disulfide removal tank are operated in series with two tanks, the carbonyl sulfide adsorbent is filled with 20L, the disulfide adsorbent is filled with 25L / tank, the test temperature is 25°C, the test pressure is 1.3MPa, and the on-site liquid hydrocarbon flow rate is 12L / h . After analysis and testing, the sulfides in the liquid hydrocarbons are mainly disulfides and COS, of which disulfides account for 70-84.5%, COS accounts for 15-29.5%, and other sulfides account for 0.5%. The running time of the test is 600 hours, the adsorption capacity of the adsorbent is 2.6%, the average removal rate is over 90%, the removal effect of disulfide and COS is obvious, and the removal results of total sulfur are shown in Table 1. Af...

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Abstract

The invention relates to a deep desulfurization technology of a refinery liquefied petroleum gas. The technology is characterized in that an efficient selective adsorbent is used to adsorb and remove sulfides in liquid hydrocarbon or mixed C4 obtained after the mercaptan removal in a refinery in order to realize recycle. The technology selects an appropriate adsorbent to adsorb and remove carbonyl sulfide in the liquid hydrocarbon or the mixed C4 and then to remove disulfide in the liquid hydrocarbon or the mixed C4 in order to realize the deep desulfurization. The total sulfur content in the liquid hydrocarbon or the mixed C4 obtained after processing through the technology reduces to 0-20mg / m<3> from 20-400mg / m<3>. After the adsorption saturation of the adsorbent, the adsorbent can be regenerated by a regeneration medium of N2, the regeneration air speed is 100-1000h<-1>, the regeneration pressure is 0-1.0MPa, and the regeneration temperature is 180-260DEG C. After the adsorbent is regenerated 30 times, the desulfurization effect of the adsorbent still reaches 95% of the desulfurization effect of the unused adsorbent.

Description

technical field [0001] The invention relates to a deep desulfurization process of liquefied petroleum gas in a refinery, in particular to a method for deep removal of sulfides in liquid hydrocarbons or mixed C4 after demercaptification in a refinery by using an adsorbent, and is mainly used in liquid hydrocarbons in a refinery Or mix C4 deep desulfurization after gas separation. Background technique [0002] Liquid hydrocarbons, as the by-product gas of catalytic cracking and delayed coking devices in refineries, contain a variety of important chemical raw materials, especially propylene in the carbon three components, 1-butene and 2-butene in the carbon four components and isobutene are scarce chemical raw materials, but due to the high total sulfur in liquid hydrocarbons, it seriously affects the range of use of liquid hydrocarbons and the processing depth of downstream products. At the same time, in recent years, the country's gasoline quality standards have become highe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/12
Inventor 刘百强任家君涂怡然毛满意张涧王春平肖翔胡海平窦勇耿艳芳陈念吴凡
Owner CHINA PETROLEUM & CHEM CORP
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