External circulation heating device of chloromethane synthesis reactor

Abstract

The utility model provides an external circulation heating device of a chloromethane synthesis reactor. A circulating pump is connected to the bottom of the synthesis reactor, an outlet of the circulating pump is divided into two paths, one path is connected with an inlet of a heater, the other path is connected with the bottom of the synthesis reactor, an outlet of the heater is connected with the synthesis reactor, a methanol feeding pipeline is connected with an outlet pipeline of the circulating pump, and a check valve is mounted on the pipeline. According to the utility model, the steam heater and the circulating pump are arranged outside the reactor to forcibly and circularly heat liquid in the reactor, so that the temperature rise operation before operation and the accurate control of the temperature in the reactor in the operation process are facilitated; and methanol is merged into a circulating pipeline, so that uniform distribution of methanol in a liquid phase is realized, and the reaction contact area of hydrogen chloride and methanol in a liquid level is further increased.

Description

Technical Field

[0001] The utility model belongs to the field of chemical industry and relates to an external circulation heating device of a chloromethane synthesis reactor. Background Art

[0002] In the organosilicon industry, chloromethane synthesis usually adopts the liquid phase methanol chlorination method. This reaction is an exothermic reaction, and the reactor temperature is usually controlled at 120-160℃.

[0003] Traditional chloromethane synthesis reactors use vaporized methanol as feed, maintaining temperature using reaction heat and the heat carried by the methanol gas. This approach is influenced by multiple factors, including the feed ratio, methanol vaporization temperature, and methanol distribution in the liquid phase. This makes precise control of the reactor temperature impossible. Furthermore, the raw materials are uniformly distributed in the liquid phase through a distributor, placing high demands on the distributor structure. Clogged distributors can significantly impact the reaction. Summary of the Invention

[0004] The utility model provides an external circulation heating method for a chloromethane synthesis reactor, which aims to achieve precise control of the reactor temperature through the external circulation heating method, add the reaction raw material methanol through the liquid phase and fully mix it, and enhance the distribution of methanol in the liquid phase.

[0005] The purpose of the utility model is achieved through the following scheme: a circulating pump is connected to the bottom discharge of the synthesis reactor, and the outlet of the circulating pump is divided into two paths, one of which is connected to the inlet of the heater and the other is connected to the bottom of the synthesis reactor. The outlet of the heater is connected to the synthesis reactor, the methanol feed pipeline is connected to the outlet pipe of the circulating pump, and a check valve is installed on the pipeline.

[0006] The material inlet and outlet of the heater are connected by an expansion joint.

[0007] The heater is provided with a steam inlet pipe and a discharge pipe, and adopts steam as a heat source. The steam inlet pipe and the discharge pipe are provided with a flow meter and a regulating valve.

[0008] The synthesis reactor and the synthesis reactor are vertical reactors connected in series, the synthesis reactor is the lower reactor and the synthesis reactor is the upper reactor.

[0009] There is a gas phase discharge pipe on the top of the synthesis reactor, which is connected to the synthesis reactor. The gas phase enters the liquid phase into the distributor of the synthesis reactor.

[0010] An overflow pipe is provided in the middle of the synthesis reactor and is connected to the synthesis reactor. Liquid from the synthesis reactor can enter the synthesis reactor through the overflow pipe.

[0011] The advantages of the present invention are: 1. The lower kettle heater is used to heat up the upper and lower kettles simultaneously, which is convenient for the start-up operation of the device. 2. The lower kettle heater is used to achieve precise control of the reactor temperature. The traditional chloromethane synthesis reactor vaporizes and superheats methanol to react with hydrogen chloride in the reactor, and the heat carried by methanol and the reaction heat are used to maintain the temperature in the reactor. This method is greatly affected by the feed ratio and the reaction conditions in the reactor. The present invention arranges a steam heater and a circulation pump outside the reactor to force circulation heating of the liquid in the reactor, which is convenient for the heating operation before operation and the precise control of the temperature in the reactor during operation; and methanol is incorporated into the circulation pipeline to achieve uniform distribution of methanol in the liquid phase, further increasing the reaction contact area between hydrogen chloride and methanol in the liquid level. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the external circulation heating structure of the chloromethane synthesis reactor, which includes synthesis reactor 1, synthesis reactor 2, circulation pump 3, heater 4, heating pipe 5, overflow pipe 6, and gas phase discharge pipe 7. DETAILED DESCRIPTION

[0013] The present invention and its specific embodiments are described in further detail below with reference to the accompanying drawings.

[0014] Example 1

[0015] like Figure 1 As shown, an external circulation heating device for a chloromethane synthesis reactor is connected to a circulation pump 3 at the bottom discharge of the synthesis reactor 1. The outlet of the circulation pump 3 is divided into two paths, one of which is connected to the inlet of the heater 4 and the other is connected to the bottom of the synthesis reactor 2. The outlet of the heater 4 is connected to the synthesis reactor 1, and the methanol feed pipeline is connected to the outlet pipe of the circulation pump 3, and a check valve is installed on the pipeline.

[0016] Synthesis Reactor 1 and Synthesis Reactor 2 are vertical reactors connected in series. A gas phase discharge pipe is located at the top of Synthesis Reactor 1, connected to Synthesis Reactor 2. The gas phase enters the liquid phase through the distributor of Synthesis Reactor 2. An overflow pipe is located in the middle of Synthesis Reactor 2, connected to Synthesis Reactor 1. Liquid from Synthesis Reactor 2 can enter Synthesis Reactor 1 through overflow pipe 6.

[0017] The material inlet and outlet of the heater 3 are connected by an expansion joint. The heater 3 is provided with a steam inlet pipe and a discharge pipe, and uses steam as a heat source. The steam inlet pipe and the discharge pipe are provided with a flow meter and a regulating valve.

[0018] Example 2: Heating Operation

[0019] Open the bottom discharge valve of Synthesis Reactor 1 and the inlet valve of Circulation Pump 3. Once the steam from Heater 4 is drained, start Circulation Pump 3 and open the steam regulating valve of Heater 4 to a steam flow rate of 0.5 t / h. When the temperature of Synthesis Reactor 1 reaches 50°C, open the corresponding valves in the upper kettle heating pipe 5 from Circulation Pump 3 to Synthesis Reactor 2. Open the upper kettle overflow pipe 6 and the lower kettle gas phase discharge pipe 7, and heat the upper and lower kettles simultaneously. When the temperature of Synthesis Reactor 1 reaches 130°C and Synthesis Reactor 2 reaches 120°C, the heating is complete. Close the corresponding valves in the upper kettle heating pipe 5 from Circulation Pump 3 to Synthesis Reactor 2.

Claims

1. An external circulation heating device for a chloromethane synthesis reactor, characterized in that: The bottom discharge of the synthesis reactor 1 (1) is connected to the circulation pump (3). The outlet of the circulation pump (3) is divided into two paths, one path is connected to the inlet of the heater (4), and the other path is connected to the bottom of the synthesis reactor 2 (2) through the heating pipe (5). The outlet of the heater (4) is connected to the synthesis reactor 1 (1). The methanol feed pipeline is connected to the outlet pipeline of the circulation pump (3), and a check valve is installed on the pipeline.

2. The external circulation heating device of the chloromethane synthesis reactor according to claim 1, characterized in that: The inlet and outlet of the heater (4) are connected by an expansion joint.

3. The external circulation heating device of the chloromethane synthesis reactor according to claim 1, characterized in that: The heater (4) is provided with a steam inlet pipe and a discharge pipe, and steam is used as a heat source. The steam inlet pipe and the discharge pipe are provided with a flow meter and a regulating valve.

4. The external circulation heating device of the chloromethane synthesis reactor according to claim 1, characterized in that: Synthesis reactor 1 (1) and synthesis reactor 2 (2) are vertical reactors connected in series, synthesis reactor 1 (1) is the lower reactor, and synthesis reactor 2 (2) is the upper reactor.

5. The external circulation heating device of the chloromethane synthesis reactor according to claim 1, characterized in that: There is an overflow pipe (6) in the middle of the synthesis reactor 2 (2) connected to the synthesis reactor 1 (1), and the liquid in the synthesis reactor 2 (2) can enter the synthesis reactor 1 (1) through the overflow pipe.

6. The external circulation heating device of the chloromethane synthesis reactor according to claim 1, characterized in that: The top of the synthesis reactor 1 (1) is provided with a gas phase discharge pipe (7), which is connected to the synthesis reactor 2 (2) and enters the liquid phase into the distributor of the synthesis reactor 2 (2).

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