Chemical cleaning agent for scaling substances of isocyanate heat exchanger as well as preparation method and application of chemical cleaning agent

A technology of isocyanate and cleaning agent, which is applied in the field of chemical cleaning agent and preparation of scaling in isocyanate heat exchangers. It can solve problems such as poor solubility and inability to achieve cleaning effects, and achieve short construction period, easy production recovery, and accelerated reaction rate Effect

Pending Publication Date: 2022-03-11
WANHUA CHEM GRP
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AI-Extracted Technical Summary

Problems solved by technology

[0007] The current commonly used chemical cleaning agents are mostly water-based, that is, to clean scales or scales that are soluble in water. For scales formed by non-water-soluble...
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Method used

Above-mentioned chemical cleaning agent is carried out cleaning effect verification, and method is, the metal hanging sheet of adhesion isocyanate fouling is soaked 12h in above-mentioned chemical cleaning agent, after soaking, effect is as shown in Figure 7, former hard and dense...
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Abstract

The invention discloses a chemical cleaning agent for scaling substances of an isocyanate heat exchanger as well as a preparation method and application of the chemical cleaning agent, and the cleaning agent is prepared from the following components in parts by weight: 0.01-3 parts of a catalyst A, 0.01-3 parts of a catalyst B, 0.5-2 parts of strong alkali, 5-20 parts of water and 80-150 parts of an organic solvent C, wherein the catalyst A is a tertiary amine catalyst, and the catalyst B is an organic metal catalyst. According to the cleaning agent, the isocyanate heat exchanger can be rapidly cleaned under the condition that equipment is not disassembled, descaling is thorough, the operation amount is small, the construction period is short, production is easy to recover, and meanwhile corrosion or mechanical damage to the heat exchanger is avoided.

Application Domain

Detergent mixture composition preparationOrganic non-surface-active detergent compositions +2

Technology Topic

IsocyanateOrganosolv +7

Image

  • Chemical cleaning agent for scaling substances of isocyanate heat exchanger as well as preparation method and application of chemical cleaning agent
  • Chemical cleaning agent for scaling substances of isocyanate heat exchanger as well as preparation method and application of chemical cleaning agent
  • Chemical cleaning agent for scaling substances of isocyanate heat exchanger as well as preparation method and application of chemical cleaning agent

Examples

  • Experimental program(8)
  • Comparison scheme(2)

Example Embodiment

[0038] Example 1
[0039] A chemical cleaning agent for criminals of isocyanate heatula, including water, triamine, tin tin, sodium hydroxide, and N, N-dimethylacetamide.
[0040] The various distribution ratios and formulation methods of the chemical cleaning agent are as follows: 1 part of the triamine, 0.5 parts of tin tin is dissolved in 100 parts of N, N-dimethylacetamide, fully dissolved, to obtain the first A solution; 0.5 parts of sodium hydroxide was dissolved in 10 parts of water, and the second solution was obtained, and the above first solution and the second solution were mixed uniform to obtain the chemical cleaning agent.
[0041]The cleaning effect of the above chemical cleaning agent is verified. The method is, the metal hanging sheet of the adhesive alicycocyanate scale is soaked in the chemical cleaning agent for 12 h, and the effect is as shown in Fig. 1;
[0042] from Figure 1B It can be seen that the fouling of the front hangup surface is a hard dense yellow solid. After soaking the chemical cleaning agent prepared by the example, the fouling is loose, the color is white, the texture is soft, and the hook The surface is approximately disengaged, and the part has been detached, and the unfolded portion can be detached.

Example Embodiment

[0043] Example 2
[0044] A chemical cleaning agent for criminals of isocyanate heatula, including water, triamine, dibutyltin, sodium hydroxide and N, N-dimethylacetamide.
[0045] The various distribution ratios and formulation methods of the chemical cleaning agent are as follows: 0.8 parts of the three-dimethyl diamine, 0.3 parts of tin tin is dissolved in 100 parts of N, N-dimethylacetamide, fully dissolved, resulting in the first A solution; 0.5 parts of sodium hydroxide was dissolved in 10 parts of water, and the second solution was obtained, and the above first solution and the second solution were mixed uniform to obtain the chemical cleaning agent.
[0046] The cleaning effect of the above chemical cleaning agent is verified. The method is, the metal hanging sheet of the adhesive alicycanate scale is soaked in the chemical cleaning agent for 12 h, and the soaking effect is close to Example 1, and the fouling has a significant softening. Dropping phenomenon, the unfolded portion can be detached.

Example Embodiment

[0047] Example 3
[0048] A chemical cleaning agent for crust of isocyanate heatula, including water, tetramethyleneamine, iron iron, sodium hydroxide and N, N-dimethylacetamide.
[0049] The various distribution ratios and formulation methods of the chemical cleaning agent are as follows: 2 parts of the tri-methylene diamine, 1 part of tin tin is dissolved in 100 parts of N, N-dimethylformamide, fully dissolved, resulting in the first A solution; 0.5 parts of sodium hydroxide was dissolved in 10 parts of water, and the second solution was obtained, and the above first solution and the second solution were mixed uniform to obtain the chemical cleaning agent.
[0050] The cleaning effect of the above chemical cleaning agent is verified. The method is, the metal hanging sheet of the adhesive isocyanate scale is soaked in the chemical cleaning agent for 12 h, and the fouling after soaking has been detached, the reaction product color is white, texture Soft.

PUM

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Description & Claims & Application Information

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