Molecular sieve precision filter recovery device

Abstract

The utility model provides a kind of molecular sieve precision filter recovery device, including precision filter, the precision filter is equipped with nitrogen pipeline, hot water pipeline and recovery pipeline;The nitrogen pipeline is equipped with first regulating valve and flowmeter, the hot water pipeline is equipped with second regulating valve, the precision filter is connected with buffer tank by recovery pipeline, and recovery pipeline is equipped with cut-off valve;The precision filter is equipped with pressure gauge.The utility model can solve the problem that small molecular sieve blocks precision filter internal filter screen, by recovering the difluoro chloroethane in precision filter to buffer tank by recovery pipeline, heating precision filter using hot water pipeline, vaporizing liquid phase difluoro chloroethane into gas phase, and using nitrogen pipeline to purge and replace precision filter, with the advantages of convenient to use and easy to maintain.

Description

Technical Field

[0001] This utility model belongs to the field of chemical metallurgy technology and relates to a molecular sieve precision filter recovery device. Background Technology

[0002] Currently, the production of dichlorofluoroethane mainly uses chlorine and R152a as raw materials. Under certain temperature and pressure conditions, a photochlorination reaction is carried out to produce crude dichlorofluoroethane. The crude product is then washed with water and alkali to remove hydrogen chloride gas, followed by compression condensation, distillation purification, and drying to obtain R142b finished product with a purity of over 99.9%. In the above production process, dichlorofluoroethane drying mainly uses a molecular sieve dryer. Because the molecular sieve pulverizes into fine particles after a period of operation, a precision filter is installed after the molecular sieve dryer to collect the pulverized molecular sieve particles and prevent them from being carried into the finished dichlorofluoroethane product. However, after a period of operation, the fine molecular sieve particles will clog the precision filter screen. At this point, the internal filter screen needs to be cleaned. However, since the precision filter contains dichlorofluoroethane, direct discharge would easily pollute the environment and pose safety hazards. Utility Model Content

[0003] The purpose of this invention is to address the problems existing in the prior art by providing a molecular sieve precision filter recovery device, which solves the problem that the internal filter screen of the precision filter cannot be directly cleaned because the precision filter contains difluorochloroethane after being blocked by fine molecular sieves.

[0004] Therefore, the present invention adopts the following technical solution: A molecular sieve precision filter recovery device includes a precision filter, which is provided with a nitrogen pipeline, a hot water pipeline and a recovery pipeline; the nitrogen pipeline is provided with a first regulating valve and a flow meter, the hot water pipeline is provided with a second regulating valve, the precision filter is connected to a gas retarder through the recovery pipeline and the recovery pipeline is provided with a shut-off valve; the precision filter is provided with a pressure gauge.

[0005] The second regulating valve is interlocked with the pressure gauge.

[0006] The beneficial effects of this utility model are as follows: This invention can solve the problem of fine molecular sieves clogging the internal filter screen of a precision filter. By recovering the difluorochloroethane inside the precision filter to a slow-release tank through a recovery pipeline, and heating the precision filter with a hot water pipeline, all the liquid difluorochloroethane is vaporized into a gas phase. The precision filter can then be purged and replaced with nitrogen through a nitrogen pipeline. This invention has the advantages of being convenient to use and easy to maintain. Attached Figure Description

[0007] Figure 1This is a schematic diagram of the system structure of this utility model.

[0008] In the diagram, 1-nitrogen pipeline, 2-first regulating valve, 3-flow meter, 4-hot water pipeline, 5-second regulating valve, 6-recovery pipeline, 7-pressure gauge, 8-precision filter, 9-shut-off valve, 10-slow gas tank. Detailed Implementation

[0009] The technical solution of this utility model will be described below with reference to the accompanying drawings and implementation methods.

[0010] like Figure 1 As shown, a molecular sieve precision filter recovery device includes a precision filter 8, which is equipped with a nitrogen pipeline 1, a hot water pipeline 4, and a recovery pipeline 6. The nitrogen pipeline 1 is equipped with a first regulating valve 2 and a flow meter 3. In this embodiment, the first regulating valve 2 controls the nitrogen flow rate to be 10~15 Nm³. 3 / h, to avoid too much nitrogen entering the system and affecting the system pressure; the hot water pipe 4 is equipped with a second regulating valve 5, the precision filter 8 is connected to the gas retarder 10 through the recovery pipe 6, and the recovery pipe 6 is equipped with a shut-off valve 9; the precision filter 8 is equipped with a pressure gauge 7.

[0011] The second regulating valve 5 is interlocked with the pressure gauge 7. In this embodiment, the pressure of the pressure gauge 7 is set to 0.1~0.2MPa to prevent the safety hazard caused by the excessive hot water intake leading to a sharp increase in the pressure of the precision filter 8.

[0012] In use, the precision filter 8 is heated by the hot water pipe 4, which vaporizes the liquid difluorochloroethane into a gas phase. The difluorochloroethane inside the precision filter 8 is recovered to the gas storage tank 10 through the recovery pipe 6. The precision filter 8 is then purged and replaced by the nitrogen pipe 1, thus completing the cleaning operation for the precision filter 8.

Claims

1. A molecular sieve precision filter recovery device, characterized in that, The device includes a precision filter (8), which is equipped with a nitrogen pipeline (1), a hot water pipeline (4) and a recovery pipeline (6); the nitrogen pipeline (1) is equipped with a first regulating valve (2) and a flow meter (3), the hot water pipeline (4) is equipped with a second regulating valve (5), the precision filter (8) is connected to a gas simmering tank (10) through the recovery pipeline (6), and the recovery pipeline (6) is equipped with a shut-off valve (9); the precision filter (8) is equipped with a pressure gauge (7).

2. The molecular sieve precision filter recovery device according to claim 1, characterized in that, The second regulating valve (5) is interlocked with the pressure gauge (7).

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