Reclamation of waste gas and waste heat during 2-hydroxy-3-naphthoic acid production process

Abstract

The invention discloses a system for recycling waste gas and waste heat during a 2-hydroxy-3-naphthoic acid production process. The equipment for recycling the waste gas and the waste heat during the 2-hydroxy-3-naphthoic acid production process comprises a salt formation process, a carbonization process, a spray tower, a negative-pressure absorber, a spray storage tank, a water storage pond and fresh water. The salt formation process and the carbonization process are jointly connected to the spray storage tank; the spray storage tank is connected to the spray tower through a pipeline; meanwhile, the spray storage tank is also provided with a pipeline and a pump which are used for conveying the fresh water to the outside; and then, spray water from the spray tower is connected through the pipeline to return to the spray storage tank. The spray tower is connected to the negative-pressure absorber through the pipeline; the negative-pressure absorber is downwards connected to the water storage pond; the fresh water in the water storage pond is pumped to the spray tower through the pipeline; meanwhile, the fresh water in the water storage pond is pumped to the negative-pressure absorber through the pipeline; and the fresh water used as a water source is connected to the water storage pond through the pipeline. The system disclosed by the invention is simple in equipment and process, convenient in operation and use, high in stability, high in reliability, especially low in maintenance cost and low in one-time investment. By using the system disclosed by the invention, waste energy is recycled, coal resources are greatly reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to the process waste gas treatment technology of 2-hydroxy-3-naphthoic acid, in particular to the recovery and utilization of waste heat from the production waste gas of 2-hydroxy-3-naphthoic acid. Background technique [0002] The 2-hydroxy-3-naphthoic acid project was introduced in the Soviet Union in the 1950s. As an important chemical intermediate raw material, it is widely used in the pigment and pharmaceutical manufacturing industries. However, with the increasing importance of environmental protection and energy conservation And urgently, some defects in its original craft are becoming increasingly prominent. Although it has been improved repeatedly by many technicians of many domestic production enterprises, the problem has not been fundamentally solved. The waste gas in the production process of 2-hydroxy-3-naphthoic acid is mainly produced by the two processes of salt formation and carbonization. The exhaust gas is mai...

AI Technical Summary

Problems solved by technology

Its defects are reflected in the following aspects: 1. Large fixed investment: the dehydration pipe of each reactor needs to be connected to a shell and tube condenser of ≧20m2

2. High maintenance cost: Since the shell side of the tube-and-tube condenser will gradually foul during use, it must be cleaned regularly

3. Low energy utilization rate: After heat exchange of exhaust gas, the heat energy is wasted; at the same time, after the material is subjected to the carbon carboxylation process, it enters the post-treatment process, which needs to be diluted with a large amount of water. consume a lot of heat

4. The production process of the product cannot achieve zero emission of exhaust gas: since the heat exchange effect of the condenser is a process of gradually weakening during use, the condensation effect on exhaust gas is unstable; zero emission cannot be achieved

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