Butyronitrile polymerization reactor

Abstract

The invention relates to a butyronitrile polymerization reactor, which comprises an adjustable stirring device, ring type internal energy pipe main pipes, adjustable stirring blades, a reactor cylinder body, a reactor upper head and a reactor lower head. The upper part of the reactor cylinder body is connected to the reactor upper head, and the lower part is connected to the reactor lower head. The reactor upper head is provided with a material outlet, and the reactor lower head is provided with a material inlet. The ring type internal energy pipe main pipes are disposed in the reactor cylinder body and are in connection with round calandrias. The lower part of the adjustable stirring device is provided with 4-10 groups of adjustable stirring blades. The invention makes technological improvement on a reactor shell, a mechanical stirrer's structural form and cooling calandrias according to reaction characteristics, increases the reaction volume, and performs scientific organic combination of the interaction of the stirrer and the internal energy pipes' positions, improves the heat transfer efficiency, and meets safe backmixing requirements. With reduced production energy consumption, the butyronitrile polymerization reactor realizes a maximum production capacity of emulsion polymerized butyronitrile and lowest energy consumption of unit polymerization volume. Compared with general reactors, the gel and jelly are reduced by 80%.

Description

technical field [0001] The invention belongs to the field of mechanical manufacturing, in particular to a nitrile polymerization reactor. [0002] Background technique [0003] At present, general-purpose emulsion reactors are used in the production equipment of nitrile rubber, and the main problems of traditional reactors are as follows: [0004] 1. The polymerization volume is relatively small: the reaction time of nitrile rubber is generally 22-28 hours. Due to the limited volume of a single reactor, the production capacity of a single line is limited by the number of reactors. At present, the largest foreign country is 20,000 tons / line. [0005] 2. Unstable control of combined acrylonitrile: Due to internal structure reasons, the range of combined acrylonitrile in the existing reactor is relatively wide, and the polymer combined acrylonitrile is easy to fluctuate by ±2%, resulting in fluctuations in product quality. [0006] 3. It is easy to produce jelly and needs to ...

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Problems solved by technology

[0004]1. The polymerization volume is relatively small: the reaction time of nitrile rubber is generally 22-28 hours. Due to the limited volume of a single reactor, the production capacity of a single line is limited by the individual reactors. Quantity limit, currently the largest abroad is 20,000 tons / line

[0005]2. Unstable control of bound acrylonitrile: due to internal structure, the range of bound acrylonitrile in existing reactors is relatively wide, and polymer bound acrylonitrile is easy to fluctuate ±2% , resulting in product quality fluctuations

[0006]3. It is easy to produce jelly and needs to be cleaned frequently: the tubes of traditional reactors are easy to hang glue. After a period of time, in order to control the reaction temperature, only the evaporation pressure of liquid ammonia will cause If the temperature is lower than zero, gel will be produced at this time. In addition, the traditional reactor adopts flange connection in the kettle to install the internal energy tube, which is very easy to glue and leak. When the glue is serious, it needs to be cleaned. Therefore, in order to ensure product quality, it is necessary to Frequent cleaning, the cleaning cycle is 2-6 months, which increases the production cycle and reduces production efficiency

[0007]4. Mooney viscosity fluctuation: Due to the limitation of the stability of the polymerization temperature control in the traditional reactor, the Mooney viscosity of the polymer fluctuates by ±8%. Blending solution, affecting product quality

If the continuous production capacity of each polymerization tank is 2-6 months, 8-12 butyronitrile reactors are required for an annual output of 15,000 tons. If the production needs to be increased, more reactors need to be connected in series, which increases the investment. And the difficulty of polymerization production control is very high, and the product quality is easy to fluctuate

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