Hydrogen sulfide remover and preparation method thereof

Abstract

The invention discloses a hydrogen sulfide remover and a preparation method thereof, and relates to the technical field of oilfield chemical treatment, the hydrogen sulfide remover comprises 200-300 parts of methanol, 100-120 parts of ethidene diamine, 80-90 parts of carbinol amine and 145-175 parts of dichloromethane, during preparation, nitrogen is introduced into a reaction kettle for 15-30 min to replace oxygen, 200-300 parts of methanol, 100-120 parts of ethidene diamine and 80-90 parts of carbinol amine are added, stirring is carried out for 20-30 min, and the hydrogen sulfide remover is obtained. Stirring is started, the reaction kettle is cooled to 10-15 DEG C, 145-175 parts of dichloromethane is added into the reaction kettle, constant-temperature stirring is kept at 10-15 DEG C for 12-16 h for reaction, and the hydrogen sulfide remover is obtained. According to the hydrogen sulfide remover and the preparation method thereof, hydrogen sulfide in a crude oil pipeline system can be removed, the hydrogen sulfide remover has good water solubility, the reaction speed with hydrogen sulfide is high, a reaction product has high stability and is soluble in water, the absorption rate of hydrogen sulfide is 100%, and no hydrogen sulfide is left.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield chemical treatment, and in particular to a hydrogen sulfide remover and a preparation method thereof. Background Art

[0002] The high concentration of hydrogen sulfide produced in the process of crude oil extraction in oil fields not only has an impact on human health, but also causes corrosion hazards to facilities and pipelines. The hydrogen sulfide in crude oil is constantly decomposed with the changes in the amount of associated gas, pressure, temperature, and water content, and accumulates at nodes such as wellheads, oil pipelines, separators, sedimentation tanks, and oil storage tanks. The concentration of hydrogen sulfide at each node in the gathering and transportation system, especially in the joint station, changes with the change in the amount of processed liquid. There is a rapid accumulation of hydrogen sulfide at nodes such as storage tanks. In severe cases, leakage may cause safety accidents to workers. In the production process, the hydrogen sulfide accumulated in the gathering and transportation system not only poses a safety hazard, but also causes equipment corrosion to a certain extent, resulting in economic losses.

[0003] Currently, the commonly used methods for removing hydrogen sulfide are: physical desulfurization, chemical desulfurization, and biological desulfurization. Among them, the chemical method is the most commonly used method. Chemical substances that can react with hydrogen sulfide include alkali, triazines, alcohol amines and other liquid hydrogen sulfide removers. Since the existing technology cannot completely absorb hydrogen sulfide after treating it, there are still some technical problems related to residual hydrogen sulfide. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a method for preparing a hydrogen sulfide remover machine, which can not only remove hydrogen sulfide in the crude oil pipeline system, but also has good water solubility, a fast reaction speed with hydrogen sulfide, and a reaction product with strong stability and solubility in water, and a hydrogen sulfide absorption rate of 100%, without any hydrogen sulfide residue.

[0005] In order to solve the problems existing in the background technology, the present invention adopts the following technical scheme: comprising methanol, ethylenediamine, methanolamine and dichloromethane, the content of each component is 200-300 parts of methanol, 100-120 parts of ethylenediamine, 80-90 parts of methanolamine and 145-175 parts of dichloromethane.

[0006] The preparation method is as follows: a. Pass nitrogen into the reactor for 15 to 30 minutes to replace oxygen; b. Add 200-300 parts of methanol, 100-120 parts of ethylenediamine, and 80-90 parts of methanolamine into the reaction kettle and start stirring; c. Cool the reactor to 10-15°C, add 145-175 parts of dichloromethane into the reactor, keep the temperature at 10-15°C and stir for 12-16 hours to obtain a hydrogen sulfide remover. The beneficial effects of the present invention are as follows: the present invention can not only remove hydrogen sulfide in the crude oil pipeline system, but also has good water solubility, a fast reaction speed with hydrogen sulfide, a reaction product has strong stability and is soluble in water, and a hydrogen sulfide absorption rate of 100%, with no hydrogen sulfide residue. DETAILED DESCRIPTION

[0007] The present invention specifically adopts the following implementation mode: comprising methanol, ethylenediamine, methanolamine and dichloromethane, wherein the content of each component is 200-300 parts of methanol, 100-120 parts of ethylenediamine, 80-90 parts of methanolamine and 145-175 parts of dichloromethane.

[0008] Based on the above components, the preparation method is as follows: a. Pass nitrogen into the reactor for 15 to 30 minutes to replace oxygen; b. Add 200-300 parts of methanol, 100-120 parts of ethylenediamine, and 80-90 parts of methanolamine into the reaction kettle and start stirring; c. Cool the reactor to 10-15°C, add 145-175 parts of dichloromethane into the reactor, maintain a constant temperature of 10-15°C and stir for 12-16 hours to obtain a hydrogen sulfide remover. Example

[0009] Nitrogen was introduced into the reactor for 15 to 30 minutes to replace oxygen, 200 parts of methanol, 100 parts of ethylenediamine, and 80 parts of methanolamine were added, stirring was started, the reactor was cooled to 10 to 15°C, 145 parts of dichloromethane were added to the reactor, and the constant temperature of 10 to 15°C was maintained and stirred for 16 hours to obtain a hydrogen sulfide remover. Example

[0010] Nitrogen was introduced into the reactor for 15 to 30 minutes to replace oxygen, 250 parts of methanol, 110 parts of ethylenediamine and 85 parts of methanolamine were added, stirring was started, the reactor was cooled to 10 to 15°C, 160 parts of dichloromethane were added to the reactor, and the temperature was maintained at 10 to 15°C and stirred for 14 hours to obtain a hydrogen sulfide remover. Example

[0011] Nitrogen was introduced into the reactor for 15 to 30 minutes to replace oxygen, 300 parts of methanol, 120 parts of ethylenediamine and 90 parts of methanolamine were added, stirring was started, the reactor was cooled to 10 to 15°C, 175 parts of dichloromethane were added to the reactor, and the temperature was maintained at 10 to 15°C and stirred for 12 hours to obtain a hydrogen sulfide remover.

[0012] Example 4 Determination of hydrogen sulfide removal rate Weigh 6.0g of 1% sodium sulfide solution and add it to a 500mL wide-mouth bottle, then add about 100g of deionized water, cover it with a lid that can hold the test tube, add 1mL of the hydrogen sulfide remover of Example 1-3 to be tested with a pipette, and shake well. Then add 0.64mL of 1.5% H2SO4 solution, quickly cover the lid and put the bottle into a 50℃ constant temperature water bath to react for 30min; do a blank at the same time.

[0013] After 45 minutes, the mass concentration of hydrogen sulfide in the experimental wide-mouth bottle was measured using a hydrogen sulfide detection tube.

[0014] The desulfurization rate can be calculated according to formula (1): …… ... Where: M0——blank H2S concentration, mg / L; M1——H2S concentration of liquid hydrogen sulfide absorbent, mg / L; X——H2S desulfurization rate of sample.

[0015] Table 1 Example 1-3 Determination of Hydrogen Sulfide Removal Rate of Hydrogen Sulfide Remover and Commercially Available Triazine Hydrogen Sulfide Remover Pharmacy Dosing concentration Residual concentration of hydrogen sulfide, mg / L Sulfur removal rate, % Example 1 1% 0 100 Example 2 1% 0 100 Example 3 1% 0 100 Triazine hydrogen sulfide remover (commercially available) 1% 9.0 98.54 blank 0 617 From the experimental results in the above application examples, it can be seen that the hydrogen sulfide remover of the present invention has an excellent removal effect on hydrogen sulfide, with a hydrogen sulfide removal rate of 100% and a residual hydrogen sulfide concentration of 0; the commercially available triazine hydrogen sulfide remover has a hydrogen sulfide removal rate of 98.54% and a residual hydrogen sulfide concentration of 9 mg / L.

[0016] The hydrogen sulfide removal effect of the hydrogen sulfide removal agent of the present invention is obviously better than that of the commercially available triazine hydrogen sulfide removal agent.

[0017] In summary, the hydrogen sulfide remover and its preparation method can not only remove hydrogen sulfide in the crude oil pipeline system, but also have good water solubility, react quickly with hydrogen sulfide, and the reaction product has strong stability and is soluble in water. Moreover, the hydrogen sulfide absorption rate is 100%, and there is no hydrogen sulfide residue.

Claims

1. A hydrogen sulfide remover, characterized in that: The invention comprises methanol, ethylenediamine, methanolamine and dichloromethane, wherein the content of each component is 200-300 parts of methanol, 100-120 parts of ethylenediamine, 80-90 parts of methanolamine and 145-175 parts of dichloromethane.

2. A method for preparing a hydrogen sulfide remover according to claim 1, characterized in that: The preparation method is as follows: a. Pass nitrogen into the reactor for 15 to 30 minutes to replace oxygen; b. Add 200-300 parts of methanol, 100-120 parts of ethylenediamine, and 80-90 parts of methanolamine into the reaction kettle and start stirring; c. Cool the reactor to 10-15°C, add 145-175 parts of dichloromethane into the reactor, maintain a constant temperature of 10-15°C and stir for 12-16 hours to obtain a hydrogen sulfide remover.