Device for converting carbon tetrachloride into methane chloride in methyl chloride production

Abstract

The utility model provides a device for converting carbon tetrachloride into methane chloride in the production of methane chloride, which can efficiently and economically convert the byproduct carbon tetrachloride and methanol steam in the production of methane chloride into methane chloride. The device comprises a primary reactor, a secondary reactor, a product condenser, a hydrochloric acid collecting tank, a hydrochloric acid pump, a pipeline mixer, a methanol feed pipe, a carbon tetrachloride feed pipe, a product condenser discharge pipe, a hydrochloric acid discharge pipe, a hydrochloric acid return pipe, a methane chloride discharge pipe and a hydrochloric acid feed pipe, an inlet of the pipeline mixer is connected with a methanol feeding pipe and a carbon tetrachloride feeding pipe, and an outlet of the pipeline mixer is connected with an inlet of the first-stage reactor; the outlet of the first-stage reactor is connected with the inlet of the second-stage reactor; an inlet of the product condenser is connected with an outlet of the secondary reactor, an outlet of the product condenser is connected with an inlet of the hydrochloric acid collecting tank through a discharge pipe of the product condenser, and a hydrochloric acid feed pipe and a hydrochloric acid return pipe are mounted on the product condenser; an outlet of the hydrochloric acid collecting tank is connected with an inlet of the hydrochloric acid pump; an outlet of the hydrochloric acid pump is connected with the hydrochloric acid return pipe; a methane chloride discharge pipe is connected with a discharge pipe of the product condenser; the hydrochloric acid discharge pipe is connected with the hydrochloric acid return pipe.

Description

Technical Field

[0001] The utility model relates to a device for converting carbon tetrachloride into methyl chloride in the production of methyl chloride, and is mainly used for the production of methyl chloride. Background Art

[0002] Carbon tetrachloride is inevitably produced in the production of chloromethane. How to deal with the carbon tetrachloride produced in the production of chloromethane is very important. The PCE process introduced from abroad can convert carbon tetrachloride into tetrachloroethylene. However, this process has the problems of high energy consumption and high cost, and the market demand for the product tetrachloroethylene is also slightly insufficient.

[0003] Carbon tetrachloride can react with methanol to produce methyl chloride, which can not only increase the methyl chloride production per unit of chlorine, but also treat the carbon tetrachloride produced in the production of methyl chloride. Therefore, how to efficiently and economically convert carbon tetrachloride into methyl chloride is the focus of the current methyl chloride production. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned shortcomings in the prior art and to provide a device for converting carbon tetrachloride into methyl chloride in methyl chloride production with a reasonable structural design, which can efficiently and economically convert the by-product carbon tetrachloride and methanol vapor in the methyl chloride production into methyl chloride.

[0005] The utility model adopts the technical scheme to solve the above-mentioned problem: a device for converting carbon tetrachloride into methyl chloride in methyl chloride production, characterized in that it comprises a primary reactor, a secondary reactor, a product condenser, a hydrochloric acid collecting tank, a hydrochloric acid pump, a pipeline mixer, a methanol feed pipe, a carbon tetrachloride feed pipe, a product condenser discharge pipe, a hydrochloric acid discharge pipe, a hydrochloric acid reflux pipe, a methyl chloride discharge pipe and a hydrochloric acid feed pipe; the inlet of the pipeline mixer is connected with the methanol feed pipe and the carbon tetrachloride feed pipe, and the outlet is connected with the inlet of the primary reactor; the outlet of the primary reactor is connected with the inlet of the secondary reactor; the inlet of the product condenser is connected with the outlet of the secondary reactor, and the outlet is connected with the inlet of the hydrochloric acid collecting tank through the product condenser discharge pipe, and a hydrochloric acid feed pipe and a hydrochloric acid reflux pipe are installed on the product condenser; the outlet of the hydrochloric acid collecting tank is connected with the inlet of the hydrochloric acid pump, and the outlet of the hydrochloric acid pump is connected with the hydrochloric acid reflux pipe; the methyl chloride discharge pipe is connected with the product condenser discharge pipe; and the hydrochloric acid discharge pipe is connected with the hydrochloric acid reflux pipe.

[0006] The utility model provides a first-stage reactor with a heat-conducting oil feed pipe and a first-stage reactor heat-conducting oil discharge pipe, and a first-stage reactor heat-conducting oil regulating valve is installed on the heat-conducting oil discharge pipe.

[0007] The utility model has a first-stage reactor with a first-stage reactor thermometer installed on it.

[0008] The utility model provides a secondary reactor with a heat transfer oil feed pipe and a heat transfer oil discharge pipe, and a second heat transfer oil regulating valve is installed on the heat transfer oil discharge pipe.

[0009] The utility model has a secondary reactor thermometer installed on the secondary reactor.

[0010] The utility model is provided with a circulating water inlet pipe and a circulating water return pipe on the product condenser.

[0011] A circulating water regulating valve is installed on the circulating water return pipe of the utility model.

[0012] The hydrochloric acid collecting tank of the utility model is provided with a first liquid level gauge and a second liquid level gauge on both sides thereof.

[0013] The utility model has a liquid level regulating valve installed on the hydrochloric acid discharge pipe.

[0014] Compared with the prior art, the utility model has the following advantages and effects:

[0015] 1. The device uses methanol vapor and carbon tetrachloride vapor to react to produce methyl chloride, carbon dioxide and water, and also produces hydrochloric acid as a by-product;

[0016] 2. The device can process carbon tetrachloride, which is an inevitable by-product in the production of chloromethane, and convert it into chloromethane, thus turning waste into treasure. The conversion rate of carbon tetrachloride is higher than 90%;

[0017] 3. The reactant methanol vapor and the main product methyl chloride of the device are respectively the raw materials and products in the production of methyl chloride, and no additional raw material and product storage tanks are required;

[0018] 4. The device operates smoothly, is highly efficient and energy-saving, realizes the rational utilization of carbon tetrachloride, and improves the economic benefits of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0021] The utility model comprises a primary reactor 1, a secondary reactor 2, a product condenser 3, a hydrochloric acid collecting tank 4, a hydrochloric acid pump 5, a pipeline mixer 6, a primary reactor thermometer 7, a secondary reactor thermometer 8, a No. 1 liquid level gauge 9, a No. 2 liquid level gauge 10, a No. 1 heat transfer oil regulating valve 11, a No. 2 heat transfer oil regulating valve 12, a circulating water regulating valve 13, a liquid level regulating valve 14, a methanol feed pipe 15, a carbon tetrachloride feed pipe 16, a primary reactor feed pipe 17, A secondary reactor feed pipe 18, a product condenser feed pipe 19, a product condenser discharge pipe 20, a hydrochloric acid pump feed pipe 21, a hydrochloric acid discharge pipe 22, a hydrochloric acid reflux pipe 23, a methyl chloride discharge pipe 24, a primary reactor heat transfer oil feed pipe 25, a primary reactor heat transfer oil discharge pipe 26, a secondary reactor heat transfer oil feed pipe 27, a secondary reactor heat transfer oil discharge pipe 28, a hydrochloric acid feed pipe 29, a circulating water inlet pipe 30 and a circulating water return pipe 31.

[0022] The inlet of the pipeline mixer 6 is connected to the methanol feed pipe 15 and the carbon tetrachloride feed pipe 16, and the outlet is connected to the inlet of the primary reactor 1 through the primary reactor feed pipe 17. The outlet of the primary reactor 1 is connected to the inlet of the secondary reactor 2 through the secondary reactor feed pipe 18. The primary reactor 1 is provided with a primary reactor heat transfer oil feed pipe 25 and a primary reactor heat transfer oil discharge pipe 26, and a first heat transfer oil regulating valve 11 is installed on the primary reactor heat transfer oil discharge pipe 26. The primary reactor 1 is provided with a primary reactor thermometer 7. The secondary reactor 2 is provided with a secondary reactor heat transfer oil feed pipe 27 and a secondary reactor heat transfer oil discharge pipe 28, and a second heat transfer oil regulating valve 12 is installed on the secondary reactor heat transfer oil discharge pipe 28. The secondary reactor 2 is provided with a secondary reactor thermometer 8.

[0023] The inlet of the product condenser 3 is connected to the outlet of the secondary reactor 2 through the product condenser feed pipe 19, and the outlet is connected to the inlet of the hydrochloric acid collecting tank 4 through the product condenser discharge pipe 20. The product condenser 3 is equipped with a circulating water inlet pipe 30, a circulating water return pipe 31, a hydrochloric acid feed pipe 29 and a hydrochloric acid reflux pipe 23, and a circulating water regulating valve 13 is installed on the circulating water return pipe 31.

[0024] The outlet of the hydrochloric acid collecting tank 4 is connected to the inlet of the hydrochloric acid pump 5 through the hydrochloric acid pump feed pipe 21, and the outlet of the hydrochloric acid pump 5 is connected to the hydrochloric acid reflux pipe 23. A No. 1 liquid level gauge 9 and a No. 2 liquid level gauge 10 are respectively installed on both sides of the hydrochloric acid collecting tank 4. The chloromethane discharge pipe 24 is connected to the product condenser discharge pipe 20. The hydrochloric acid discharge pipe 22 is connected to the hydrochloric acid reflux pipe 23, and a liquid level regulating valve 14 is installed on the hydrochloric acid discharge pipe 22.

[0025] When the device starts to operate, the heat transfer oil enters the primary reactor 1 and the secondary reactor 2 through the primary reactor heat transfer oil feed pipe 25 and the secondary reactor heat transfer oil feed pipe 27 respectively, and the valve opening is adjusted by the first heat transfer oil regulating valve 11 and the second heat transfer oil regulating valve 12 to control the temperature of the primary reactor 1 and the secondary reactor 2 at about 260°C. The primary reactor thermometer 7 and the secondary reactor thermometer 8 monitor the temperature of the primary reactor 1 and the secondary reactor 2 respectively. The superheated methanol vapor enters the pipeline mixer 6 through the methanol feed pipe 15 and the superheated carbon tetrachloride vapor enters the pipeline mixer 6 through the carbon tetrachloride feed pipe 16 for mixing. The mixed reaction gas enters the primary reactor 1 through the primary reactor feed pipe 17, and enters the secondary reactor 2 through the secondary reactor feed pipe 18 to continue the reaction after the initial reaction in the primary reactor 1. The primary reactor 1 and the secondary reactor 2 are both equipped with aluminum oxide or aluminum oxide catalyst impregnated with zinc chloride. The high-temperature product after the reaction enters the product condenser 3 through the product condenser feed pipe 19 for spray cooling. In the product condenser 3, dilute hydrochloric acid sprays and cools the product through the hydrochloric acid reflux pipe 23 and the product condenser hydrochloric acid feed pipe 29, and absorbs the hydrogen chloride gas in the product. At the same time, the product is cooled by the circulating water in the circulating water inlet pipe 30, and the product temperature is controlled at 40°C by adjusting the opening of the circulating water regulating valve 13 on the circulating water return pipe 31. The cooled product is discharged through the product condenser discharge pipe 21, and the gaseous products such as methyl chloride and carbon dioxide are discharged through the methyl chloride discharge pipe 24 to the next process for impurity removal, and the liquid product enters the hydrochloric acid collecting tank 4. The liquid product is mainly hydrochloric acid and also contains a small amount of methyl chloride. The liquid product completes static stratification in the hydrochloric acid collecting tank 4, and the hydrochloric acid phase enters the hydrochloric acid pump 5 through the hydrochloric acid pump feed pipe 21 for pressurization and is discharged through the hydrochloric acid discharge pipe 22. The liquid level on the hydrochloric acid side of the hydrochloric acid collecting tank 4 is adjusted by the opening of the liquid level regulating valve 14, and the liquid level on the other side and the methyl chloride phase level are indicated by the No. 1 liquid level meter 9.

[0026] The chemical reactions involved in the above process are as follows:

[0027] Main reaction: CCl 4 +2H 2 O =CO 2 +4HCl,CH 3 OH+HCl=CH 3 Cl+H 2 Oh,

[0028] Overall reaction formula: 4CH 3 OH+CCl 4 =4CH 3 Cl+CO 2 + 2H 2 O +232KJ.

[0029] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the utility model. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the utility model are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A device for converting carbon tetrachloride into methyl chloride in the production of methyl chloride, characterized in that: It comprises a primary reactor, a secondary reactor, a product condenser, a hydrochloric acid collecting tank, a hydrochloric acid pump, a pipeline mixer, a methanol feed pipe, a carbon tetrachloride feed pipe, a product condenser discharge pipe, a hydrochloric acid discharge pipe, a hydrochloric acid reflux pipe, a methyl chloride discharge pipe and a hydrochloric acid feed pipe; the inlet of the pipeline mixer is connected to the methanol feed pipe and the carbon tetrachloride feed pipe, and the outlet is connected to the inlet of the primary reactor; the outlet of the primary reactor is connected to the inlet of the secondary reactor; The inlet of the product condenser is connected to the outlet of the secondary reactor, and the outlet is connected to the inlet of the hydrochloric acid collecting tank through the product condenser discharge pipe. A hydrochloric acid feed pipe and a hydrochloric acid reflux pipe are installed on the product condenser; the outlet of the hydrochloric acid collecting tank is connected to the inlet of the hydrochloric acid pump, and the outlet of the hydrochloric acid pump is connected to the hydrochloric acid reflux pipe; the monochloromethane discharge pipe is connected to the product condenser discharge pipe; and the hydrochloric acid discharge pipe is connected to the hydrochloric acid reflux pipe.

2. The device for converting carbon tetrachloride into methyl chloride in the production of methyl chloride according to claim 1, characterized in that: A first-stage reactor heat transfer oil feed pipe and a first-stage reactor heat transfer oil discharge pipe are installed on the first-stage reactor, and a No. 1 heat transfer oil regulating valve is installed on the first-stage reactor heat transfer oil discharge pipe.

3. The device for converting carbon tetrachloride into methyl chloride in the production of methyl chloride according to claim 1, characterized in that: A primary reactor thermometer is installed on the primary reactor.

4. The device for converting carbon tetrachloride into methyl chloride in the production of methyl chloride according to claim 1, characterized in that: The secondary reactor is provided with a secondary reactor heat transfer oil feed pipe and a secondary reactor heat transfer oil discharge pipe, and a No. 2 heat transfer oil regulating valve is installed on the secondary reactor heat transfer oil discharge pipe.

5. The device for converting carbon tetrachloride into methyl chloride in the production of methyl chloride according to claim 1, characterized in that: A secondary reactor thermometer is installed on the secondary reactor.

6. The device for converting carbon tetrachloride into methyl chloride in the production of methyl chloride according to claim 1, characterized in that: A circulating water inlet pipe and a circulating water return pipe are installed on the product condenser.

7. The device for converting carbon tetrachloride into methyl chloride in the production of methyl chloride according to claim 6, characterized in that: A circulating water regulating valve is installed on the circulating water return pipe.

8. The device for converting carbon tetrachloride into methyl chloride in the production of methyl chloride according to claim 1, characterized in that: A No. 1 liquid level gauge and a No. 2 liquid level gauge are respectively installed on both sides of the hydrochloric acid collecting tank.

9. The device for converting carbon tetrachloride into methyl chloride in the production of methyl chloride according to claim 1, characterized in that: A liquid level regulating valve is installed on the hydrochloric acid discharge pipe.

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