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A low-temperature hydrolysis method for removing carbonyl sulfide in liquefied petroleum gas

A technology of liquefied petroleum gas and carbonyl sulfide, which is applied in chemical instruments and methods, petroleum industry, gas fuels, etc., can solve the problems such as the reduction of catalyst life, and achieve the effects of long service life, high catalytic activity and high hydrolysis conversion rate.

Active Publication Date: 2016-06-15
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

The desulfurizer converts COS into elemental sulfur and deposits it on the surface of the catalyst. Although a one-step removal of COS is achieved, the life of the catalyst will decrease with the deposition of elemental sulfur.

Method used

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  • A low-temperature hydrolysis method for removing carbonyl sulfide in liquefied petroleum gas
  • A low-temperature hydrolysis method for removing carbonyl sulfide in liquefied petroleum gas

Examples

Experimental program
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Embodiment 1

[0036] This embodiment provides a low-temperature hydrolysis method for removing carbonyl sulfide in liquefied petroleum gas, and its specific process flow is as follows figure 1 As shown, it specifically includes the following steps: the LPG raw material after amine washing enters the system from the first injection port 1, and the alcohol amine solution enters the system from the second injection port 2, and the two are mixed in the first static mixer 3 Evenly, enter the COS hydrolysis reactor 4 with a volume of 10mm×300mm, contact with a COS hydrolysis catalyst (5mL) to react, remove COS and hydrogen sulfide in LPG, and obtain a reaction mixture;

[0037] 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 alcoholamine solution and tap water are settled down, and are discharged from the raffinate discharge port 8, and the COS after the COS is removed LPG flows out from...

Embodiment 2

[0044] This example provides a low-temperature hydrolysis method for removing carbonyl sulfide in liquefied petroleum gas, and the specific method is similar to that of Example 1.

[0045] Based on 100% mass percentage, the composition of the carbonyl sulfide hydrolysis catalyst used is: 10% MgO, 90% γ-Al 2 o 3 +TiO 2 (γ-Al 2 o 3 Content is 94%, TiO 2 The content is 6%); the particle size of the catalyst is 20-40 mesh.

[0046] COS hydrolysis reaction evaluation conditions: the adopted LPG raw material is raw material 1, its properties are shown in Table 1, the reaction temperature is 30 ° C, the pressure is 1.0 MPa, and the concentration is 30 wt %. The addition of N-methyldiethanolamine solution is 5wt% of LPG, the volumetric space velocity of LPG is 6h -1 .

[0047] The calculation results show that the COS content in the LPG after COS removal is reduced from 252.7 μg / g to 3.8 μg / g, the hydrogen sulfide content is 0 μg / g, and the COS removal rate is 98.5%.

Embodiment 3

[0049] This example provides a low-temperature hydrolysis method for removing carbonyl sulfide in liquefied petroleum gas, and the specific method is similar to that of Example 1.

[0050] Based on 100% mass percentage, the composition of the carbonyl sulfide hydrolysis catalyst used is: 10wt% ZnO, 90wt% γ-Al 2 o 3 +TiO 2 (γ-Al 2 o 3 Content is 92wt%, TiO 2 The content is 8wt%); the particle size of the catalyst is 20-40 mesh.

[0051] COS hydrolysis reaction evaluation conditions: the adopted LPG raw material is raw material 1, its properties are shown in Table 1, the reaction temperature is 30 ° C, the pressure is 1.0 MPa, and the concentration is 30 wt %. The addition of N-methyldiethanolamine solution is 5wt% of LPG, the volumetric space velocity of LPG is 4h -1 .

[0052] The calculation results show that the COS content in the LPG after COS removal is reduced from 252.7 μg / g to 5.3 μg / g, the hydrogen sulfide content is 0 μg / g, and the COS removal rate is 97.9%.

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Abstract

The invention provides a low-temperature hydrolysis method for removing carbonyl sulfide in liquefied petroleum gas. The method comprises the following steps: mixing the liquefied petroleum gas after amine washing with an alcohol amine solution, and performing hydrolysis reaction under the action of a carbonyl sulfide hydrolysis catalyst to remove carbonyl sulfide and hydrogen sulfide in the liquefied petroleum gas and hydrogen sulfide generated by hydrolysis; separating the liquefied petroleum gas from the alcohol amine solution, then washing with water to obtain the refined liquefied petroleum gas and recycling the alcohol amine solution, wherein the adding amount of the alcohol amine solution is 0.1%-20% of the weight of the liquefied petroleum gas. By adopting the low-temperature hydrolysis method for removing carbonyl sulfide in the liquefied petroleum gas provided by the invention, carbonyl sulfide and hydrogen sulfide in the liquefied gas can be removed in one step under the condition of 10-60 DEG C, the step of removing hydrogen sulfide in a conventional process is eliminated, the process is simple, the activity of the catalyst is high, the service life is long and the conversion rate of carbonyl sulfide is above 97%.

Description

technical field [0001] The invention relates to a method for removing carbonyl sulfide, in particular to a low-temperature hydrolysis method for removing carbonyl sulfide, and belongs to the technical field of petrochemical industry. Background technique [0002] Liquefied petroleum gas (LPG) includes refinery liquefied gas, a small amount of cracked liquefied gas and oilfield gas recovery liquefied gas, etc. 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 a chemical industry Raw material is one of the main high value-added products of refineries. [0003] With the increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/12B01J21/10B01J23/06B01J23/02B01J27/04B01J27/18
Inventor 柯明刘强鲍晓军陈冬宋昭峥石冈刘前保刘晓兵刘志红于建宁何盛宝
Owner BC P INC CHINA NAT PETROLEUM CORP
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