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Method for refining liquefied petroleum gas

A liquefied petroleum gas and refining method technology, applied in the field of liquefied petroleum gas refining, can solve problems such as complicated process flow, unqualified copper sheet corrosion, excessive total sulfur of liquefied petroleum gas, etc., and achieve simple process flow, convenient operation, and removal good effect

Active Publication Date: 2014-08-20
BC P INC CHINA NAT PETROLEUM CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LPG usually contains H 2 S, COS, CS 2 , mercaptans, thioethers and disulfides and other toxic and harmful components, especially H 2 S, COS and mercaptan have high content of three kinds of sulfides, which are more harmful. If they are not removed, it will not only cause great pollution to the environment in the subsequent processing and use process, but also cause great pollution to the processing equipment and equipment. Severe corrosion of mechanical equipment
[0004] The traditional LPG refining unit consists of two parts: alcohol amine dehydrogen sulfide and Merox extraction oxidative sweetening. Among them, the refining technology of alcohol amine dehydrogen sulfide is very mature, but there are many problems in Merox extraction oxidative sweetening: (1) pre-alkali In the step of washing, the utilization rate of caustic soda is low, and the discharge of waste alkali residue is large. In addition, the regular replacement of the agent alkali used in the Merox extraction process also has the problem of discharge of waste alkali residue, which has caused great pressure on the refinery's environmental protection; ( 2) The problem of excessive total sulfur in liquefied gas and unqualified copper sheet corrosion often occurs. Extracting the oxidized caustic soda with light oil can alleviate the problem of total sulfur exceeding the standard, but it cannot solve the problem of copper sheet corrosion; (3) The process is complicated , the washing of LPG after alkali extraction produces a large amount of alkaline wastewater, causing serious environmental pollution problems
This method does not provide a viable solution for the removal of thioetherification products

Method used

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  • Method for refining liquefied petroleum gas
  • Method for refining liquefied petroleum gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment provides a refining method for liquefied petroleum gas, its technological process is as follows figure 1 As shown, the method specifically includes the following steps:

[0052] The system pressure is about 1 MPa to keep the LPG raw material in the liquid phase. The LPG raw material (liquefied petroleum gas after amine washing from Hohhot Petrochemical Company) enters the system through the first inlet 1, and the alcohol amine solution enters through the second inlet 2. In the system, the two are uniformly mixed in the first static mixer 3, enter the COS hydrolysis reactor 4, contact with the COS hydrolysis catalyst, and react to remove COS and hydrogen sulfide of LPG to obtain a reaction mixture;

[0053] The reaction mixture enters the settling tank 7 after being mixed with the tap water entered by the third sample inlet 5 in the second static mixer 6, and the alcohol amine solution and tap water are settled, and are discharged from the raffinate outle...

Embodiment 2

[0064] This embodiment provides a method for refining liquefied petroleum gas, the specific steps of which are the same as in Embodiment 1, the difference from Embodiment 1 is:

[0065] The COS hydrolysis catalyst used is CaO / γ-Al 2 o 3 +TiO 2 Catalyst, in terms of 100% mass percentage, the composition of COS hydrolysis catalyst comprises: CaO is 9wt%, TiO 2 -Al 2 o 3 91wt% (among them, Al 2 o 3 90wt% TiO 2 10 wt%), the particle size of the COS hydrolysis catalyst is 20-40 mesh.

[0066] The thioetherification catalyst used is NiO-WO 3 / SiO 2 -Al 2 o 3 Catalyst, in terms of 100% mass percentage, the composition of thioetherification catalyst comprises: NiO is 15wt%, WO 3 3wt%, SiO 2 -Al 2 o 3 is 82wt% (of which, Al 2 o 3 85wt%, SiO 2 is 15 wt%), and the particle size of the thioetherification catalyst is 20-40 mesh.

[0067] The processing parameters of refined LPG: (1) be the alcohol amine solution with the N-methyldiethanolamine solution of 30wt% with conc...

Embodiment 3

[0070] This embodiment provides a method for refining liquefied petroleum gas, the specific steps of which are the same as in Embodiment 1, the difference from Embodiment 1 is:

[0071] The COS hydrolysis catalyst used is BaO / γ-Al 2 o 3 +TiO 2 Catalyst, in terms of 100% mass percentage, the composition of COS hydrolysis catalyst comprises: BaO is 9wt%, TiO 2 -Al 2 o 3 91wt% (among them, Al 2 o 3 90wt% TiO 2 10 wt%), the particle size of the COS hydrolysis catalyst is 20-40 mesh.

[0072] The thioetherification catalyst used is NiO-MoO 3 / SiO 2 -Al 2 o 3 Catalyst, in terms of 100% mass percentage, the composition of thioetherification catalyst includes: NiO is 14wt%, MoO 3 6wt%, SiO 2 -Al 2 o 3 80wt% (among them, Al 2 o 3 85wt%, SiO 2 is 15 wt%), and the particle size of the thioetherification catalyst is 20-40 mesh.

[0073] The processing parameter of refined LPG: (1) be the diethanolamine solution of 15wt% with concentration as alcohol amine solution, its ...

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Abstract

The invention provides a method for refining liquefied petroleum gas. The method comprises the following steps: mixing amine-washed liquefied petroleum gas and an alcohol amine solution, and removing carbonyl sulfide and hydrogen sulfide from the liquefied petroleum gas under the coaction of a carbonyl sulfide hydrolysis catalyst and the alcohol amine solution; performing sulfur etherification reaction in contact with a sulfur etherification catalyst to ensure that mercaptan in the liquefied petroleum gas is reacted with olefin and converted into a thioether compound with a high boiling point, and simultaneously performing selective hydrogenation saturation on diolefin; performing distillation treatment, and separating the liquefied petroleum gas fraction from the thioether compound with the high boiling point to obtain a deep desulfurized liquefied petroleum gas product, wherein the refined liquefied gas can be used for producing low-sulfur methyl tertiary butyl ether and alkylation gasoline. According to the method disclosed by the invention, the carbonyl sulfide and the hydrogen sulfide are removed by adopting a one-step method, and the mercaptan is removed by using the catalytic reaction between the raw material components, so that no alkali residue is discharged, the existing process for refining the liquefied petroleum gas is simplified, meanwhile, the purpose of deep desulfurization is achieved, and the sulfur content of the refined liquefied petroleum gas is reduced to below 5mu g / g.

Description

technical field [0001] The invention relates to a refining method for liquefied petroleum gas, in particular to a refining method for removing sulfides such as hydrogen sulfide, mercaptan and carbonyl sulfide from liquefied petroleum gas, and belongs to the technical field of petrochemical industry. Background technique [0002] Liquefied petroleum gas (LPG) includes refinery liquefied gas, a small amount of pyrolysis liquefied gas and oilfield gas recovery liquefied gas, etc., of which 90% of LPG is produced by refineries, mainly from catalytic cracking, hydrocracking, delayed coking and other devices. The main component of LPG is C with high value 3 、C 4 Olefins and alkanes, with an average molecular weight of 50-52, contain a small amount of sulfur impurities, are gaseous at normal temperature and pressure, are flammable and explosive, have high calorific value and separability, and can be directly used as fuel gas or separated as chemical raw materials , is one of the ...

Claims

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Application Information

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IPC IPC(8): C10L3/12
Inventor 鲍晓军柯明刘强陈冬黄德奇宋昭峥石冈刘前保刘晓兵何盛宝于建宁刘志红
Owner BC P INC CHINA NAT PETROLEUM CORP
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