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Efficient and energy-saving caprolactam production method

A technology of caprolactam and production methods, applied in the preparation of lactam, chemical instruments and methods, ammonium nitrate, etc., can solve the problems of large volume of reaction equipment, occupying a lot of space, long residence time, etc., and achieve technical level improvement , saving energy consumption and improving production efficiency

Pending Publication Date: 2022-07-05
QUZHOU JUHUA POLYAMIDE FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing process, a medium temperature (50-60°C) negative pressure (absolute pressure 10KPa) synthesis process is adopted, and the material stays in the reactor for a long time, resulting in an excessively large volume of the reaction equipment and occupying a lot of space
During the reaction process, it is necessary to maintain negative pressure all the time, which consumes a lot of energy, and also causes a lot of waste of heat generated by the reaction of ammonia and transposition ester.

Method used

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  • Efficient and energy-saving caprolactam production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A high-efficiency and energy-saving caprolactam production method is characterized in that comprising the following steps:

[0034] Step 1: The gas ammonia 2000kg / h and the rearrangement liquid 10000kg / h from outside the boundary react in the neutralization reactor 1 of the mother liquor containing ammonium sulfate, and the gaseous ammonia reacts with the sulfuric acid in the rearrangement liquid in an equimolar ratio. The acidity of sulfuric acid in the discharge liquid is 40%, the flow rate of ammonium sulfate-containing mother liquor is 80t / h, the reaction temperature is 100°C, the reaction pressure is 0.08MPa, and the reaction time is 0.1h. The reaction heat is absorbed and evaporated by the water in the ammonium sulfate mother liquor, 4t / h by-product steam is sent to the ammonia oximation process for use;

[0035] Step 2: The reaction liquid in step 1 overflows to separator 2, completes the separation of crude oil and ammonium sulfate solution at 105°C and 0.09MPa...

Embodiment 2

[0041] A high-efficiency and energy-saving caprolactam production method is characterized in that comprising the following steps:

[0042] Step 1: The gas ammonia 1950kg / h and the rearrangement liquid 13000kg / h from outside the boundary react in the neutralization reactor 1 of the mother liquor containing ammonium sulfate, and the gaseous ammonia reacts with the sulfuric acid in the rearrangement liquid in an equimolar ratio, and the heavy The acidity of sulfuric acid in the drain is 45%, the flow rate of ammonium sulfate-containing mother liquor is 80t / h, the reaction temperature is 105°C, the reaction pressure is 0.16MPa, and the reaction time is 0.20h. The reaction heat is absorbed and evaporated by the water in the ammonium sulfate mother liquor, 5.0 t / h by-product steam is sent to the ammonia oximation process for use;

[0043] Step 2: The reaction liquid in step 1 overflows to separator 2, completes the separation of crude oil and ammonium sulfate solution at 110°C and 0...

Embodiment 3

[0050] A high-efficiency and energy-saving caprolactam production method is characterized in that comprising the following steps:

[0051] Step 1: The gas ammonia 2500kg / h and the rearrangement liquid 18500kg / h from outside the boundary are reacted in the neutralization reactor 1 of the mother liquor containing ammonium sulfate, and the gaseous ammonia reacts with the sulfuric acid in the rearrangement liquid in an equimolar ratio. The acidity of sulfuric acid in the discharge liquid is 50%, the flow rate of ammonium sulfate-containing mother liquor is 120t / h, the reaction temperature is 110°C, the reaction pressure is 0.24MPa, and the reaction time is 0.25h. The reaction heat is absorbed and evaporated by the water in the ammonium sulfate mother liquor, 7.5 t / h by-product steam is sent to the ammonia oximation process for use;

[0052] Step 2: The reaction liquid in step 1 overflows to separator 2, completes the separation of crude oil and ammonium sulfate solution at 110 ° C...

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Abstract

The invention relates to the field of caprolactam production, in particular to an efficient and energy-saving caprolactam production method. According to the high-efficiency and energy-saving caprolactam production method provided by the invention, the original process is improved, so that the mass transfer process of the reaction is enhanced, the reaction rate is increased, heat generated by the reaction is effectively utilized, the power consumption of the original process is reduced, the energy consumption is more effectively saved, the production cost is reduced, and the production efficiency is improved; and finally, the technical level of the old process is comprehensively improved.

Description

technical field [0001] The invention relates to the field of caprolactam production, in particular to a high-efficiency and energy-saving caprolactam production method. Background technique [0002] Caprolactam, chemical formula C 6 H 11 NO, with a molecular weight of 113.16, is one of the important organic chemical raw materials. The appearance is white powder or crystal, and it has an oily feel. The main purpose is to generate polyamide chips (usually called nylon-6 chips, or nylon-6 chips) through polymerization, which can be further processed into nylon fibers, engineering plastics, and plastic films. Nylon-6 chips have different emphasis on application fields with different quality and indicators. [0003] CN97196496.3 applied for a method for preparing caprolactam by utilizing 6-aminocapronitrile, a method for preparing caprolactam by cyclizing 6-aminocapronitrile in the presence of high temperature water and in the presence or absence of a catalyst and a solvent, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/18C07D201/02C07D223/10
CPCC01C1/185C07D223/10C07D201/02
Inventor 周黎旸夏碧波郑燕春徐先荣赵孝顺余宏滔姜雨土王凌
Owner QUZHOU JUHUA POLYAMIDE FIBER