The reactor for the production of allylchloride

 

(57) Abstract:

The reactor includes a feed area of the initial reagents, tubular zone, connected to the feeding zone of the initial reagents, input the initial reagents and the exhaust device. The feeding zone of the initial reagents and the tubular reactor form a closed circuit in the form of a vertical cylindrical apparatus of the type "pipe in pipe". In the cavity of the lower portion of the inner cylinder has a device for forced circulation with the location in which is formed a closed loop input device propylene to the forced circulation device, the input device of chlorine after the input device, propylene, prom device that is made in the form of a series of holes in the wall of the outer cylinder, covered on the outside of the ring collector in the form of a shirt with a branch pipe before input device propylene. The use of this invention provides increased selectivity of the process, increasing the yield of the target product allylchloride. 1 C.p. f-crystals, 1 Il.

The invention relates to a technology for chlorohydrocarbons by the chlorination of olefins, in particular to a device for receiving allylchloride used in the form of ª of allylchloride used in industry method of high-temperature gaseous chlorination of propylene gaseous chlorine. The chlorination process, usually carried out at a temperature 400-530oC without removal of heat of reaction, at a temperature of the propylene feedstock 260-400oC and at a molar ratio of propylene and chlorine of not less than 1.2:1.0 in.

Known reactor obtain allylchloride interaction of propylene and chlorine, with more than one insertion openings of propylene and more than one hole for the separate input of chlorine, the relative position of which is determined by the equation

0,5 L/(dp+dc) 20,

where dp is the diameter of the insertion openings of propylene;

dc - diameter of the insertion openings of propylene;

L is the distance between the centers of the holes of both types.

Use nozzles in which the channels for supplying the reagents located on two circles - the outer (propylene) and internal (chlorine) in parallel to the Central axis. The nozzles have a flat or conical cut, and the flow direction defined by the configuration of the apertures may overlap and form an angle in the range of 30oand the angle formed by the direction of flow and the axis of the nozzle equal 0-60o/U.S. patent 5.367.105, 22.11.94./.

Chlorination of propylene in the described reactor is carried out at a linear speed of passage through the openings DL is P>2.

The disadvantage of the reactor is the presence of areas of high concentrations of chlorine in the reaction space, leading to pereplanirovki propylene to high products and coke.

Known reactor to obtain allylchloride made in the form of a vertical metal tube with a ratio of height to diameter 15:1-30:1, is provided in the lower part of the system ogladania and continued top nozzle ejector type, inside the shape of a truncated cone, extending from top to bottom. The reactor consists of three zones: zone a - truncated cone - highly turbulent zone, limited downwards by the intersection of imaginary extensions forming a cone with the walls of the tube; zone b - zone mixing with intensive recycling; zone From the remainder of the tube, which is the area of the mixing piston type. Above zone a is the input system of reagents or three concentric cylinders surrounded by a water jacket, through duzu in the reactor comes chlorine, and through the annular section between duty and the external cylinder - propylene. /Romanian patent N 57828, 25.12.74/.

Chlorination of propylene in the specified reactor is carried out at a temperature of 450-530oC and a pressure of 1-3 kg/cm2.

I chlorination process. Which leads to additional energy consumption for preheating of propylene and high education high products and coke.

The closest reactor of the same purposes of the claimed device according to the totality of symptoms is the reactor that includes a feed area of the initial reagents, tubular zone, connected to the feeding zone of the initial reagents, input the initial reagents and outlet for the reaction products /WO 96/37450/.

Getting allylchloride in the specified reactor is realized by the interaction of propylene and chlorine when a molar ratio of at least 2.5:1 and at a temperature of 400-525oC.

For reasons that impede the achievement of specified following technical result when using the known reactor, taken as a prototype, is that in the known reactor receiving allylchloride carry out the interaction of propylene with chlorine at a temperature of 400-525oC and at this temperature the mixture, i.e., a large concentration of chlorine in the mixing zone of the source reagents at high temperatures preclude optimal conditions considered horizontally isothermal surface process. The result is a large number the of conditions considered horizontally isothermal surface process and ensure a relatively low concentration of chlorine in the reaction mass by mixing reagents.

The technical result in the use of the invention is expressed in increasing the selectivity of the process to increase the yield of the target product lilliard.

This technical result in the implementation of the invention is achieved in that in the known reactor peculiarity lies in the fact that the flow of reagents and the tubular reactor form a closed circuit in the form of a vertical cylindrical apparatus of the type "pipe in pipe", in the cavity of the lower portion of the inner cylinder which has a device for forced circulation with the location in which is formed a closed loop input device propylene to the forced circulation device, the input device of chlorine - after input devices propylene, the discharge device made in the form of a series of holes in the wall of the outer cylinder, covered on the outside of the ring collector in the form of a shirt with a branch pipe, before input device propylene. In addition, the peculiarity lies in the fact that the input device of chlorine made in the form of radially perforated pipes fixed on the floor, for the passage of chlorine, the shaft of the device for forced circulation.

In the study otnay design when implementing the process of obtaining allylchloride.

The design of the reactor shown in the drawing.

The reactor for the production of allylchloride is a vertical type device "pipe in pipe", which formed the outer 1 and inner 2 cylinders. The outer cylinder 1 ends with elliptical bottoms. On the walls of the upper floor are the reflectors 8. In the center of the bottom plate is a pipe 7 through which passes coaxially rotating shaft 5. At the end of the shaft 5 is located impeller 4 t with blades. Over the shoulder blades on the inner wall of the cylinder is fixed straightener apparatus 3.

The rotating shaft 5, the impeller 4 blades and a rectifying device 3 form a device for forced circulation, which provides circulation of the reaction gases in a closed circuit formed by the internal volume of the cylinder and the space between the inner and outer cylinders.

The rotating shaft 5 is made hollow. On the shaft under the blades of the impeller, mounted radially perforated branch pipes 7a, communicating with the internal space of the shaft 5. The hollow shaft 5 and the nozzles 7a to form the input device of chlorine with the location of it when the input device propylene.

Enter propylene in the reactor oscom 7 and the rotating shaft 5.

The lower part of the inner and outer cylinder, an input device of chlorine, the connection of the input of propylene and device for forced circulation form the feed area of the initial reagents.

The inner cylinder and the space between the inner and outer cylinders forming the tubular reactor.

The conclusion of the reaction gases from the reactor is carried out on the lower part of the outer cylinder, covered with annular manifold 6b in the form of a shirt with a branch pipe 6.

The reactor operates as follows.

Propylene, preheated to a temperature of 200-400oC, is fed into the reactor through pipe input propylene. In the feed area of the source reagents propylene is mixed with the circulating gases with a temperature of 420-470oC at a volume ratio of circulating gases to the total number of initial reagents (multiplicity circulation), equal to 5:20, with the relatively cool propylene removes excess exothermic heat of reaction. Through the input device of chlorine serves chlorine with a temperature of 20-50oC. the Volume ratio of the initial reagents is 2-4: 1, respectively. In a tubular reactor process for the chlorination of propylene is carried out at a temperature of 420-the m the reactor of this design allows for the chlorination of propylene in a narrow temperature as close as possible to the optimal one. Improving conditions considered horizontally isothermal surface is provided by the high rate of circulation of the reaction gases through the device for forced circulation.

2. That mixture of propylene with chlorine is carried out at low concentrations of chlorine in the feed area of the initial reagents, and it is provided both by dilution of the initial reagents circulating reaction gases, and due to the large ratio of circulation, which ultimately leads to increased yield of the target product.

3. In reducing energy consumption for recycling propylene.

1. The reactor for the production of allylchloride, including the feeding zone of the initial reagents, tubular zone, connected to the feeding zone of the initial reagents, input the initial reagents and outlet for the reaction products, wherein the feeding zone of the initial reagents and the tubular reactor form a closed circuit in the form of a vertical cylindrical apparatus of the type "pipe in pipe", in the cavity of the lower portion of the inner cylinder which resoloved propylene until a forced circulation, input devices chlorine - after input devices propylene, the discharge device made in the form of a series of holes in the wall of the outer cylinder, covered on the outside of the ring collector in the form of a shirt with a branch pipe before input device propylene.

2. The reactor under item 1, characterized in that the input device of chlorine made in the form of radially perforated pipes fixed on the floor, for the passage of chlorine, the shaft of the device for forced circulation.

 

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33 cl, 1 tbl, 1 ex

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1 ex, 1 dwg

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