A condenser and an ammonia treatment device and method including the condenser

Abstract

The invention relates to the field of ammonia treatment in the production of caprolactam, in particular to a condenser and an ammonia treatment device and method comprising the condenser. An embodiment of the present invention provides a condenser, which is a single-head condenser. The cylinder body is located between the upper tube sheet and the lower tube sheet and is welded to one side of the upper tube sheet and the lower tube sheet respectively, the other side of the upper tube sheet is fixedly connected to the head, and the other side of the lower tube sheet is connected to the equipment tube The mouth is fixedly connected; the embodiment of the present invention provides the ammonia treatment device that comprises above-mentioned condenser, comprises the tert-butanol tank that the top is provided with vent opening, single head condenser, the ammonia gas absorption tank that water is housed and the first pipeline; The other side of the lower tube plate is fixedly connected with the vent port of the tert-butanol tank, and the head of the single-head condenser is provided with a gas phase outlet, and the gas phase outlet is connected with the ammonia absorption barrel through the first pipeline. Ammonia recovery can be achieved, environmental pollution can be avoided, and energy waste can be reduced.

Description

technical field [0001] The invention relates to the field of ammonia treatment in the production of caprolactam, in particular to a condenser and an ammonia treatment device and method comprising the condenser. Background technique [0002] The appearance of caprolactam is white powder or crystal, with an oily feel. It is one of the important organic chemical raw materials. Its main purpose is to produce polyamide chips (usually called nylon-6 chips, or nylon-6 chips) through polymerization, which can be further processed into nylon. Fibers, engineering plastics, plastic films. Nylon-6 slices have different application areas depending on the quality and index. [0003] There are four main preparation methods, oxime method: first, high-purity cyclohexanone and hydroxylamine sulfate are condensed at 80-110°C to generate cyclohexanone oxime. The separated cyclohexanone oxime uses fuming sulfuric acid as a catalyst, undergoes Beckmann rearrangement and transposition at 80-110°...

AI Technical Summary

Problems solved by technology

[0004] When producing caprolactam by ammoximation, the oximation reaction must first be carried out to generate cyclohexanone oxime. Generally, tert-butanol is used as the reaction medium, so the process of solvent recovery is involved. The specific process flow for tert-butanol recovery is as follows: The mixed fraction containing water, ammonia and tert-butanol steamed from the top of the tert-butanol recovery tower first enters the tert-butanol tower top air cooler to condense to about 60°C, and then passes through the tert-butanol tower top post-condenser to cool to Enter the reflux tank of the tert-butanol tower at 40°C; the uncooled non-condensable gas is mixed with the tail gas at the top of the oximation reactor and cooled, and then discharged into the tail gas absorption tower for tail gas recovery; the condensate is pressurized by the tert-butanol tower top reflux pump A part is used as tower top reflux, and most of the rest is sent to the circulating tert-butanol tank in the caprolactam raw material tank area. At this time, the circulating tert-butanol tank contains 80% tert-butanol, 8% ammonia, and 12% water. During operation, the breathing valve on the top of the storage tank releases ammonia gas when the pressure is released. Ammonia gas itself has certain toxicity and is prone to explosion in the air. In addition, directly venting ammonia gas does not achieve effective recovery of resources.

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