Cooling system of partial condenser in polyamide-6 polymerization process and process thereof

Abstract

The invention relates to a cooling system adopting a high-boiling-point fluid as a cooling medium of a polyamide-6 polymerization partial condenser. The condensation amount of materials in the partialcondenser is indirectly adjusted by controlling the circulation flow of the high-boiling-point cooling medium, the reflux ratio of the packed tower and the partial condenser is adjusted, and the separation effect of the packed tower and the partial condenser is ensured. Specifically, a high-boiling-point fluid is used as a cooling medium of a chinlon 6 polymerization partial condenser on a chinlon 6 polymerization device, so that the problem of vaporization of the cooling medium at low flow is avoided, and effective control on the condensation amount of materials in the partial condenser is realized. The high-boiling-point fluid is liquid fluid with the fluid boiling point higher than the working temperature of condensed substances in the partial condenser and higher than 100 DEG C. The system adopted by the invention can effectively reduce material and energy consumption and improve the production stability, so that a production enterprise is more competitive.

Description

technical field [0001] The invention belongs to the technical field of production technology of nylon 6 (nylon) slices, and specifically relates to a cooling system and a technology using a high-boiling point fluid as a cooling medium of a partial condenser in a nylon 6 polymerization process. Background technique [0002] The cooling medium commonly used in traditional nylon 6 polymerization devices is circulating water, but in some occasions where the temperature of the material to be cooled is high, such as the cooling medium of the partial condenser at the top of the cracker and the reactor, it is not suitable to use circulating water. In these applications, it is necessary to control the condensation of the material in the partial condenser by adjusting the flow rate of the cooling medium, so as to realize the adjustment of the reflux ratio of the packed tower and the partial condenser. Atmospheric pressure boiling point), when circulating water is used as the cooling m...

AI Technical Summary

Problems solved by technology

Due to the different working temperature, working pressure and required condensing capacity of some condensers in different positions, when sharing a set of hot water circulating cooling system, the circulating hot water can only control one working temperature and working pressure, and it is impossible to realize according to different parts of the condenser. Respective process requirements set the working temperature and working pressure of circulating hot water separately, which will further affect the accurate control of the condensing capacity (reflux ratio) of the partial condenser, which will eventually increase the energy and material consumption of the polymerization unit and affect the process stability; When different partial condensers are equipped with an independent hot water circulating cooling system, although the matching problem of the working temperature and working pressure of the circulating hot water system and the working temperature and working pressure of the partial condensers can be solved to a certain extent, it still cannot It fundamentally solves the above-mentioned problem that the circulating hot water flow rate is too low and easy to vaporize. At the same time, compared with a common cooling circulation system, there are still problems such as complex system, large equipment investment and relatively large daily operation and maintenance workload.

Images