A kind of liquid absorbent for removing hydrogen sulfide and its application

A technology of liquid absorbent and hydrogen sulfide, applied in the direction of gas fuel, chemical instruments and methods, separation methods, etc., can solve the problems of increasing the preparation process of oxazolidine compounds, no research on wellbore effect, poor water solubility, etc., to prevent air pollution Environment, high selectivity, fast response effect

Active Publication Date: 2019-04-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Triazine desulfurizers have the characteristics of strong selectivity, rapid response, and non-toxic products, but their water solubility is poor and their viscosity is high, so direct use will cause a lot of inconvenience. Domestic desulfurizers are made by adding alcohol amine compounds, small molecules Alcohols, oxazolidines and their derivatives to solve water solubility problems
Patent Publication No. CN105056710A discloses a liquid hydrogen sulfide absorbent, which contains two types of substances, one is a hexahydrotriazine compound, and the other is an oxazolidine compound. After the two are mixed in a certain proportion, they present a homogeneous phase. , solved the problem of water solubility very well, but this process increases the preparation process of oxazolidine compounds, the process is cumbersome, and there is no research on the wellbore effect of low hydrogen sulfide content

Method used

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  • A kind of liquid absorbent for removing hydrogen sulfide and its application
  • A kind of liquid absorbent for removing hydrogen sulfide and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The liquid absorbent used in this embodiment for removing hydrogen sulfide consists of the following components in weight percent: 30% mixture of hexahydrotriazine compounds and pyridine compounds, 20% acetonitrile, 50% water, of which hexahydrotriazine The weight ratio of the oxazine compound to the pyridine compound is 1:1.

[0021] The specific preparation process is: put 15g of hexahydrotriazine compounds (10g of hydroxyethylhexahydro-s-triazine, 5g of 1,3,5-trimethylhexahydro-s-triazine) into a 500mL three-necked flask, and then add 15g Pyridine compounds (pyridine 5g, 2-picoline 10g) and 20g acetonitrile, after stirring for 10 minutes, add 50g of water, continue stirring for 10 minutes and mix well to obtain the product.

[0022] The liquid absorbent for removing hydrogen sulfide prepared in this example is applied to a wellbore containing sulfur.

Embodiment 2

[0024] The liquid absorbent used in this embodiment for removing hydrogen sulfide consists of the following components in weight percent: 30% mixture of hexahydrotriazine compounds and pyridine compounds, 20% acetonitrile, 50% water, of which hexahydrotriazine The weight ratio of the oxazine compound to the pyridine compound is 3:2.

[0025] The specific preparation process is as follows: put 18g of hexahydrotriazine compounds (10g of hydroxyethylhexahydro-s-triazine, 8g of 1,3,5-tris(3-methoxypropyl)-s-triazine into a 500mL three-necked flask ), then add 12g of pyridine compounds (pyridine 4g, 2-picoline 4g, 4-picoline 4g) and 20g of acetonitrile, after stirring for 10min, add 50g of water, continue to stir for 10min and mix well to obtain.

[0026] The liquid absorbent for removing hydrogen sulfide prepared in this example is applied to a wellbore containing sulfur.

Embodiment 3

[0028] The liquid absorbent used in this embodiment for removing hydrogen sulfide consists of the following components in weight percent: 30% mixture of hexahydrotriazine compounds and pyridine compounds, 20% acetonitrile, 50% water, of which hexahydrotriazine The weight ratio of the oxazine compound to the pyridine compound is 7:3.

[0029] The specific preparation process is: put 21g of hexahydrotriazine compounds in a 500mL three-necked flask (10g of hydroxyethylhexahydro-s-triazine, 5g of 1,3,5-trimethylhexahydro-s-triazine, 2-methyl -4-amino-6-methoxy-1,3,5-triazine 6g), then add 9g pyridine compounds (4-picoline 3g, 2-hydroxypyridine 3g, 2-hydroxyethylpyridine 3g) and 20g of acetonitrile, after stirring for 10min, add 50g of water, continue to stir for 10min and mix well to obtain.

[0030] The liquid absorbent for removing hydrogen sulfide prepared in this example is applied to a wellbore containing sulfur.

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Abstract

The invention provides a liquid absorbent for removing hydrogen sulfide and application thereof. The absorbent is composed of the following components in percentage by mass: 30-50% of hexahydrotriazine-pyridine mixture, 10-20% of acetonitrile and the balance of water. By utilizing the characteristics of high selectivity, high reaction speed, nontoxic products and the like of the hexahydrotriazines in combination with the synergistic actions of the pyridines and acetonitrile, the hydrogen sulfide absorbent has the advantages of high reaction rate, favorable water solubility, simple technique and low cost. The hydrogen sulfide absorbent can be used for quickly and efficiently absorbing hydrogen sulfide in gas produced from the shaft, and the products are stable and soluble in water; and the hydrogen sulfide absorbent has favorable effects for shafts with low or slight hydrogen sulfide gas content, reduces the corrosion of hydrogen sulfide to the shaft tube pillar, and protects the in-site personnel from poisoning of hydrogen sulfide.

Description

technical field [0001] The invention relates to a liquid absorbent for removing hydrogen sulfide and its application, which belongs to the fields of petroleum, natural gas and petrochemical industry. Background technique [0002] At present, oil companies at home and abroad already have a mature process technology for the removal of hydrogen sulfide gas in high-sulfur gas fields, that is, the wet desulfurization process alcohol amine method. However, this process has disadvantages such as high investment cost, complicated process flow, large floor area, and negative correlation between desulfurization economy and processing capacity (that is, the lower the hydrogen sulfide content, the higher the desulfurization cost), especially for low-sulfur gas wells and Not applicable. Liquid hydrogen sulfide absorbent can be directly injected into the gas production wellbore. It has the advantages of convenient operation, low cost, and will not affect the daily production of gas wells...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14
CPCC10L3/103C10L2290/541
Inventor 王锦昌罗曦袁本福周瑞立刘岳龙张永刚王萍杨易骏张立强周舰杨芾汕李璇刘玉祥
Owner CHINA PETROLEUM & CHEM CORP
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