61results about How to "Normal response" patented technology

The invention relates to a method and equipment for production of adiponitrile from adipic acid, and mainly solves the problem of unstable product quality in the prior art for production of adiponitrile from adipic acid. The method employs materials of fusing adipic acid, ammonia, phosphate and a diluent. The production method is as below: mixing phosphoric acid with the diluent in a pipeline mixer; conducting neutralization of adipic acid and ammonia in a cyanation reactor; sending reaction products into the bottom of a separation tower for separation; recovering gas phase of light components from an outlet; sending the diluent recovered by a gas lifting plate into the pipeline mixer, mixing the diluent with phosphoric acid in the pipeline mixer, and sending the mixture into the cyanation reactor to dilute adipic acid; and sending a liquid phase to a scraper type evaporator. The employed equipment includes an adipic acid storage tank, an ammonia compressor, a cyanation reactor, a pipeline mixer, a separation tower, a tail gas removal tower, a phosphoric acid storage tank and a scraper type evaporator. The invention has the advantage of a good quality of the produced adiponitrile product.

The invention discloses a method for preparing silicon tetrafluoride and anhydrous hydrogen fluoride by using sodium fluorosilicate as raw material, which is characterized in that it comprises the following steps: 1) drying sodium fluorosilicate to remove water; Add sodium sulfate and sulfuric acid into the rotary kiln reactor at a molar ratio of 1:1, and react for 30-180 minutes at 160-220°C to generate sodium sulfate solid and mixed gas of silicon tetrafluoride and hydrogen fluoride; 3) Then dedust and pressurize Cool to -20~-30℃; 4) Send the pre-cooled mixed gas to the rectification tower for separation, control the pressure of the rectification tower to 0.6~0.75MPaG, the temperature of the condenser at the top of the tower is -70~-80℃, the bottom of the tower Extract anhydrous hydrogen fluoride; 5) Silicon tetrafluoride is extracted from the top of the tower in the form of liquid phase, and then sent to the silicon tetrafluoride washing tower to obtain silicon tetrafluoride gas after decompression gasification and dust removal. Corrosion of equipment, the obtained silicon tetrafluoride and hydrogen fluoride products have high purity and the production process is energy-saving and environmentally friendly.

The invention discloses a chemical looping combustion device for solid fuel grading oxidation and a method thereof. The device is a circulating loop formed by an air reactor, an air cyclone separator, a fuel reactor, a fuel cyclone separator, a return feeder, a gasification reactor and an isolator. The method includes the steps that solid fuel is subjected to gasification reaction in the gasification reactor, generated gas fuel and oxygen carrier at a poor oxidation state are subjected to oxidation reaction, generated weak reduction gas enters the fuel reactor, and the generated weak reduction gas and oxygen carrier at an oxidation state are subjected to deep oxidation reaction, are converted into carbon dioxide and steam and are discharged; oxygen carrier at a reduction state in the air reactor and air are subjected to oxidation reaction to generate oxygen carrier particles at an oxidation state, and after being separated by the air cyclone separator, the oxygen carrier particles at an oxidation state enter the fuel reactor and are reduced to oxygen carrier at a poor oxidation state through weak reduction gas; after being separated by the fuel cyclone separator, the oxygen carrier at the poor oxidation state enters the gasification reactor through the return feeder and is reduced to the oxygen carrier at a reduction state through the solid fuel gasification products, and finally the oxygen carrier particles at a reduction state are returned to the air reactor through the isolator and are regenerated to form the oxygen carrier at the oxidation state.

A continuous production oxidation furnace of highly pure titanium dioxide comprises a furnace body, the furnace body is formed by an inner container and a pressure container wrapping the inner container, and the furnace body is sequentially divided into a toluene burning segment, a bathroom segment and a scar beating salt segment. The furnace has the characteristics of energy saving, purity improvement and efficiency increase. The material of the inner container is ceramic, and the ceramic has extremely high oxidation resistance, avoids various chemical reaction oxidations and guarantees smooth implementation of reactions; and hot oxygen rings improve full oxygen and promote combustion, cooling water is used to cool a product obtained after a reaction, and a nucleation gas added in the bathroom segment can control the quality of TiO2 particles generated after oxidation, so a generated gas-solid mixture is cooled, and scabbing of an oxidation reactor is prevented. A production method also disclosed in the invention has the advantages of tail gas recycling, gas recycling, use efficiency improvement and resource waste reduction.