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Detergent for alkaline tower of ethylene unit

A technology of ethylene plant and alkali washing tower, which is applied in the direction of detergent composition, non-surface active detergent composition, inorganic non-surface active washing composition, etc., and can solve the problem of fouling and blockage of alkali washing tower and insignificant effect, etc. problem, to achieve the effect of clean operation

Pending Publication Date: 2022-05-31
浙江杭化科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are all from the perspective of inhibiting the formation of butter, and may indeed slow down the formation of butter in the alkali washing tower, but the effect is not significant, and the fouling and blockage of the alkali washing tower still occurs from time to time

Method used

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  • Detergent for alkaline tower of ethylene unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1) Preparation of polymer dispersant: under stirring conditions, slowly add 45 grams of difunctional amino-terminated polyoxyethylene ethers with a molecular weight of 200-300 into the solvent methanol, then add 25 grams of malonic anhydride, and wait until all After the addition, the temperature was raised to 60°C for 2 hours, and then the temperature was raised to 120°C to remove the solvent methanol and the generated water, and the product was the polymer dispersant, which was cooled for later use;

[0025] Step 2) Preparation of alkali washing tower detergent: under agitation, dissolve 15 grams of the above-mentioned polymer dispersant in 52 grams of water, then add 2 grams of cyclohexylamine and 3 grams of 2,2-dihydroxydiethylamine in turn , 8 gram dimethyl malonate, 20 gram potassium oxalate, promptly get described alkali washing tower cleaning agent after stirring.

Embodiment 2

[0027] Step 1) Preparation of polymer dispersant: under stirring conditions, slowly add 30 grams of difunctional amino-terminated polyoxyethylene ethers with a molecular weight of 800-1000 into the solvent 2-propanol, and then add 25 grams of succinic anhydride , after all was added, the temperature was raised to 80°C for 2 hours, then the temperature was raised to 120°C, the solvent 2-propanol and the generated water were removed, and the product was the polymer dispersant, which was cooled for later use;

[0028] Step 2) Preparation of detergent for alkali washing tower: under stirring conditions, dissolve 12 grams of the above-mentioned polymer dispersant in 48 grams of water, then add 5 grams of N-methyl-2,2-dihydroxydiethylamine, 10 grams of 2-cyano-methyl acetate and 25 grams of sodium pentahydroxyhexanoate were stirred evenly to obtain the detergent for alkali washing tower.

Embodiment 3

[0030] Step 1) Preparation of polymer dispersant: under stirring conditions, slowly add 45 grams of trifunctional amino-terminated polyoxyethylene-polyoxypropylene ether with a molecular weight of 800-1000 into the solvent 2-propanol, and then add 20 gram of maleic anhydride, after adding all of it, heat up to 80°C for 3 hours, then heat up to 140°C, remove solvent 2-propanol and generated water, the product is the polymer dispersant, cool it for backup use;

[0031] Step 2) Preparation of alkali washing tower detergent: under stirring conditions, dissolve 15 grams of the above-mentioned polymer dispersant in 50 grams of water, then add 1 gram of cyclohexylamine, 4 grams of 2,4,4-trimethyl 2-pentylamine, 4 grams of 2-chloro-ethyl acetate, 4 grams of diethyl malonate, and 22 grams of sodium thiosulfate were stirred evenly to obtain the detergent for the alkali washing tower.

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Abstract

The invention provides a detergent for an alkaline tower of an ethylene unit. The detergent for the alkaline tower comprises the following components in percentage by weight: 10-15% of a polymer dispersant, 1-5% of a free radical inhibitor, 5-10% of a carbon negative ion inhibitor, 15-25% of a reducing agent and the balance of solvent water. The cleaning agent for the alkaline washing tower is used for overcoming the phenomenon of scaling and tower blocking caused by polymerization of olefin unsaturated compounds, oxygen-containing compounds and the like in treated materials in the alkaline washing tower of a current ethylene device, and the clean operation of the alkaline washing tower is realized. The cleaning agent for the alkaline tower has good compatibility with alkaline liquor, amine liquor and the like.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and relates to a preparation method of a medicament injected during the operation of an alkali washing tower of an ethylene plant, in particular to a preparation method of a cleaning agent for an alkali washing tower of an ethylene plant. Background technique [0002] In the ethylene production process, the cracked gas from the cracking furnace usually contains acid gases such as hydrogen sulfide and carbon dioxide. Poisoning and polluting ethylene products; in addition, when carbon dioxide enters the cold process system, it will form carbon dioxide solids, which will cause blockage of the cold process system and affect the safe and stable operation of the device. The acid gas in the pyrolysis gas is generally removed in the alkali washing tower. The pyrolysis gas enters the alkali washing system from the outlet of the third or fourth stage of the compressor. In the alkali washing tower, all...

Claims

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Application Information

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IPC IPC(8): C11D7/10C11D7/26C11D7/28C11D7/32C11D7/60
CPCC11D7/3227C11D7/265C11D7/3209C11D7/3218C11D7/266C11D7/32C11D7/28C11D7/10C11D7/267
Inventor 李有金杨闯沈丹林向阳付鑫
Owner 浙江杭化科技股份有限公司