CN2766951Y

CN2766951Y - Tubular reactor

Info

Publication number: CN2766951Y
Application number: CN 200520033108
Authority: CN
Inventors: 张在利; 曾子敏; 刘忠文; 吴常根; 喻崇权; 贺谭瑞
Original assignee: Zhonghao Chenguang Research Institute of Chemical Industry Co Ltd
Current assignee: Zhonghao Chenguang Research Institute of Chemical Industry Co Ltd
Priority date: 2005-02-03
Filing date: 2005-02-03
Publication date: 2006-03-29
Anticipated expiration: 2015-02-03

Abstract

The utility model discloses a tubular reactor for preparing olefin compounds, which comprises a reaction tube positioned in a center, a heat conducting element, a plurality of heating elements which are mutually independent, and a heat insulating layer, wherein the heat conducting element, the heating elements and the heat insulating layer are orderly coated outside the reaction tube in a radial direction of the reaction tube. The power of all the heating elements is different, the reaction tube is heated in a segmental mode, the axial temperature gradient of the reaction tube can be effectively reduced and the actual temperature of the whole reaction tube is controlled within an optimum range for the generation of hexafluoropropylene. The self polymerization and the carbon formation of perfluoroethylene in a reaction process can be prevented, and the occurrence of bad side reaction can be prevented. The utility model has the advantages of long service life of the tubular reactor, high production rate and low manufacturing cost.

Description

A kind of tubular reactor

Technical field

The utility model relates to a kind of tubular reactor for preparing alkenes compounds, particularly relates to a kind of tubular reactor for preparing hexafluoropropene.

Background technology

Hexafluoropropene (also claiming perfluoropropene) is one of basic material of Organic fluoride industry, is widely used in the production of fluorubber, fluoroplastics, perfluoro propene oxid, heptafluoro-propane, fluorine surfactant etc.But it is raw material that traditional tubular reactor adopts pure tetrafluoroethene, method by tubular reactor heating Pintsch process production hexafluoropropene, owing to easily tie carbon at the easy autohemagglutination in inlet pipe oral area position, going out to manage the position, and at high temperature disproportionated reaction can take place in reaction time length, generate carbon and carbon tetrafluoride, temperature control also can induce reaction simultaneously.Thereby this class cracking reaction device exists consumption of raw materials height, accessory substance many, and the autopolymer of generation and carbon easily stop up reactor, and productive rate is lower, the more high defective of production cost.In order to overcome above-mentioned defective, in the patent No. is in the patent documentation disclosed " perfluoropropene reaction unit " of CN87209610U, at first will mix the back as the tetrafluoroethene of reactant with octafluorocyclobutane and in a tank reactor, carry out reversible reaction, after the amount for the treatment of octafluorocyclobutane wherein increases, with this mixture input tubular reactor shown in Figure 1, also finally be translated into perfluoropropene again in the hope of the autohemagglutination phenomenon that is reduced in inlet pipe oral area position.And the heating element heater 3 of this tubular reactor is a monoblock type, therefore the heating power of each section of tubular reactor is identical, thereby in cracking process, adopt same temperature to heat, because the exothermic heat of reaction axial temperature is NATURAL DISTRIBUTION, according to tetrafluoroethene at high temperature cracking reaction be exothermic reaction, the cracking reaction of octafluorocyclobutane is the characteristics of the endothermic reaction, this reaction is the course of reaction of heat absorption back heat release earlier, cause the low earlier back of Temperature Distribution high, entrance point is because of being in the endothermic reaction, its reaction temperature is lower, about 600 ℃, in reaction zone, just be heated to more than 700 ℃, and near the port of export since the reaction a large amount of heat releases, conversion temperature is then up to 800-950 ℃ even higher, the actual temperature of each section of tubular reactor differs bigger, so still exist tetrafluoroethene easily at the entrance point autohemagglutination, causes the temperature runaway phenomenon at the port of export, carbonization takes place and generate a large amount of accessory substances, the raising of overslaugh productive rate, carbonization afterreaction pipe heat-transfer effect is poor, the easy burn-out cracking tube, the service life of shortening reactor.

Summary of the invention

The purpose of this utility model is the defective that exists at the above-mentioned background technology, improve a kind of segmentation heating tubular reactor for preparing hexafluoropropene of design, effectively reduce the axial thermograde of reaction tube, the actual temperature of entire reaction pipe is controlled at generation hexafluoropropene optimum range, to reach the generation that prevents tetrafluoroethene autohemagglutination and knot carbon in the course of reaction, suppresses bad side reaction, prolong tubular reactor service life, effectively improve productive rate, purpose such as reduce production costs.

For achieving the above object, described in the utility model by tetrafluoroethene and octafluorocyclobutane mix tubular reactor that the back cracking generates hexafluoropropene comprise the reaction tube, the heat conducting element that is coated on its outside that are positioned at the center, place the heat conducting element outside and by at least two sections with upper edge reaction tube axially-aligned and separate heating element heater be in outermost adiabatic insulating barrier and form.

The temperature of reaction tube during for the ease of monitoring reaction also can be in the outside of reaction tube, axially also be provided with several temperature sensors along it.

After adopting said structure, according to tetrafluoroethene at high temperature cracking reaction be exothermic reaction, the cracking reaction of octafluorocyclobutane is the characteristics of the endothermic reaction, this reaction is the course of reaction of heat absorption back heat release earlier, several sections separate heating element heaters can be pressed power order from big to small from the entrance point of reaction tube arranges, reaction tube is carried out the segmentation heating of low temperature behind the first high temperature, the heat that utilizes reaction to produce, effectively reduce the axial thermograde of reaction tube, the actual temperature of entire reaction pipe is controlled within the generation hexafluoropropene optimum range (750 ± 30 ℃), effectively to prevent the generation of tetrafluoroethene autohemagglutination and knot carbon and temperature runaway phenomenon, suppress the generation of bad side reaction, prevent that reaction tube from cracking, improve the production efficiency of hexafluoropropene, the service life of extension reactor.

Description of drawings

Fig. 1 is the cutaway view of the tubular reactor of routine.

Fig. 2 is the cutaway view of the utility model straight tubular reactor.

Fig. 3 is the cutaway view of the utility model coiled reactor.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is further described.

Straight tubular reactor shown in Figure 2 by the reaction tube 1 that is positioned at the center, be coated on its outside heat conducting element 2, place 5 sections of heat conducting element 2 outsides separate and along the heating element heater 3 of reaction tube axially-aligned, be in outermost adiabatic insulating barrier 4 and 5 temperature sensors 5 that are installed on reaction tube 1 outside are formed.

Coiled reactor shown in Figure 3 comprises snakelike reaction tube 1, the heat conducting element 2 that is coated on its outside, 6 sections separate and spaced heating element heaters 3 that place heat conducting element 2 outsides that are positioned at the center, are formed by connecting by flange, be in outermost adiabatic insulating barrier 4 and 6 temperature sensors 5 that are installed on reaction tube 1 outside are formed.This kind structure relative complex, but can reduce thermal shock and save the space.

Claims

1. tubular reactor, comprise the reaction tube that is positioned at the center and along its heat conducting element, heating element heater, adiabatic insulating barrier that radially is coated on its outside successively, it is characterized in that described heating element heater by more than at least two sections and separate, form along the heating element heater of reaction tube axially-aligned.

2. tubular reactor according to claim 1, it is characterized in that at reaction tube the outside, axially also be provided with several temperature sensors along it.

3. tubular reactor according to claim 1 and 2 is characterized in that described reaction tube is a straight tube.

4. tubular reactor according to claim 1 and 2 is characterized in that described reaction tube is a coiled pipe.