One is dry acetylene generation technology. This technology is mainly used in the production of calcium carbide process polyvinyl chloride, is slightly more than the theoretical amount of water sprayed in the mist on the calcium carbide powder to make it hydrolyze, the resulting calcium carbide slag for the water content of 4% to 15% of dry powder, Crude acetylene has a moisture content of 75%, a reaction temperature of 90°C to 93°C in the gas phase, a solid temperature of 100°C to 110°C, and a ratio of water to calcium carbide of about 1 to 1.2:1. The heat of reaction is carried away by vaporization. Non-contact heat exchangers deliver circulating water (no dissolution loss), calcium carbide particle size less than 4 mm, hydrolysis rate not less than 99.5%, acetylene yield not less than 98.5%.
Compared with the wet acetylene production process, this technology has significant benefits in terms of equipment investment, acetylene yield, carbide slag treatment, and water treatment. Each ton of PVC produced can save 0.04 tons of calcium carbide, save 3 cubic meters of water, reduce 0.02 tons of calcium carbide dust, reduce the circulating water volume by 10 tons, and reduce the manufacturing cost by 159.7 yuan.
The second is membrane membrane cell spacing technology. The technology is based on the original NBH-2.7 high current density natural circulation bipolar ion-exchange membrane electrolyzer and draws lessons from various zero-polarity and small-pole distance sub-membrane electrolyzers technologies in the world, synthesizes various technical advantages, and solves the problems of raw materials, Difficulty of processing parts, coating technology and assembly technology to create a natural membrane ion membrane electrolysis cell with a membrane pitch suitable for Chinese users. The electrolyzers were respectively at 12.15KA and 13.8KA, the bath temperature was 88°C, and the alkali concentration was 32%. The membrane cell pitch voltage was 140mV and 180mV lower than that of the original unit cell, and the DC power consumption of the ton alkali was reduced by about 100kwh and 120kwh. Leading level of similar international products.
The third is the new process technology of chlorine gas treatment and drying in ion-exchange membrane caustic soda equipment. This technology uses a positive pressure drying, packing drying tower plus blister drying tower process. The wet chlorine containing saturated steam is washed, cooled, defogged and dried with sulfuric acid to remove the moisture from the chlorine. The use of this technology consumes 13.63kg of alkali sulfuric acid, which is less than the domestic level of 16-18kg for large and medium-sized chlor-alkali plants. This reduces sulfuric acid consumption and also reduces the burden of sparse treatment. After processing, the moisture content of chlorine gas is less than or equal to 1×10-5 (wt); it is not only significantly lower than the current domestic chlorine drying technology at the level of 2×10-4 to 4×10-4 (wt), but also lower than the international 1×10. -5 to 1.25 x 10-5 (wt) level.
As a high-energy-consuming industry, the chlor-alkali industry has great potential for energy conservation. In order to actively develop and apply new energy-saving technologies and technologies, and drastically reduce energy consumption, the oxygen cathode low-potential-voltage ion-membrane electrolysis caustic soda technology is also included in the catalogue of development support technology for the oil and chemical industry. Compared with the active cathode ion-exchange membrane electrolyzer (traditional), the theoretical cell voltage is 2.19V and 0.96V, and the theoretical decomposition voltage difference is 1.23V, which can save more than 30% of electricity. Another developmental technology for molecular sieve catalysts for the synthesis of vinyl chloride is a mercury-free technology that replaces the mercury chloride catalyst and is of great significance in protecting the environment.
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