Chisso process

Commercial plants The process has been successfully licensed 15 times worldwide. Total capacity of the Chisso process in the world is more than 1.5 million tpy. In addition, Chisso VCM removal technology has been licensed to many PVC producers worldwide. 

Commercial plants Chisso has licensed the technology to many PVC producers worldwide. More than 100 columns of the Chisso process are under operation or construction, and total capacity exceeds 5 million tpy of PVC. 

Amoco-Chisso Process This process resembles the Novolen process except that the two reactors connected in series are stirred horizontally with blades and operated at 90°C and 20 bar. Polymers produced with the Amoco-Chisso technology show high uniformity, as particle residence time distribution in the reactor is particularly narrow. 

The ketene—crotonaldehyde route through polyester with various modifications and improvements is reportedly practiced by Hoechst Celanese, Cheminova, Daicel, Ueno, Chisso, Nippon Gohsei, and Eastman Chemical Company. Differences in thein processes consist mosdy in the methods of polyester splitting and first-stage purification. Production of the potassium salt can be from finished sorbic acid or from a stream in the sorbic acid production route before the final drying step. Several patents on the process for producing sorbic acid and potassium sorbate from this route are given in the hterature. 

Chisso-Asahi uses a spouted bed process for the production of their coated materials (12). A 12,000 t/yr faciHty is located in Japan. The semicontinuous process consists of two batch fluid-bed coaters. A dilute polymer solution is prepared by dissolving 5% polymer and release controlling agent into a chlorinated hydrocarbon solvent such as trichloroethylene. The solution is metered into the spouted bed where it is appHed to the fertilizer core. Hot air, used to fluidize the granules, evaporates the solvent which is recovered and reintroduced into the process. Mineral talc, when used, is either slurried into the polymer solution or introduced into the fluidizing air. 

CEC [Chisso Engineering Company] A process for removing oxides of nitrogen from flue-gases by scrubbing with an aqueous solution containing ferrous ion and ethylenediamine tetra-acetic acid (EDTA). An iron nitrosyl compound is formed. Developed by Chisso Engineering Company, Japan, and piloted in France and Japan. 

Application A process to produce homopolymer polypropylene and ethylene-propylene random and impact co-polymers using Chisso Gas-Phase Technology utilizing horizontal plug-flow reactor. 

Chisso offers processing designs for single-production with capacities reaching 400,000 tpy. 

Chisso Polypropylene Propylene and ethylene Simplified gas-phase process with horizontal reactor and high-performance catalyst 5 1996... 

Chisso Polyvinyl chloride (suspension) Vinyl chloride monomer Batch process manufactures many PVC grades including commodity, high/low K values, matted type and copolymer PVC 12 2000... 

Chisso VCM Removal PVC slurry with unreacted VCM Stripping process for PVC plants to recover VCM from PVC slurry VCM can be reused without deteriorating polymer quality 36 2000... 

Dr Hosokawa, director of the Minamata City hospital was conducting his own experiments based on the theory from the university He fed cats waste effluent from the factory that was producing acetaldehyde and was able to produce similar symptoms in them, and he detected other changes by pathological examination at autopsy The company that owned the factory, the Chisso Minamata Chemical Company, was aware of his work and by 1959 knew that it was likely that Minamata disease was caused by the effluent from their factory In i960 methyl mercury was detected in seafood and in 1961 it was detected in sediments derived from the factory. In 1966 the factory installed a water circulation system which removed the mercury pollution. The factory eventually stopped the process in 1968 and in the same year the Japanese government announced its opinion that the disease was due to consumption of methyl mercury in contaminated fish and seafood. 

Shin-Nippon-Chisso Co. manufactured about 2,000 tons per year of acetaldehyde by the process described in Figure 1, and the side reaction yielded 0.016-0.042% of methyimercuric chloride based on acetylene. Fish and shellfish in the Minamata Bay were contaminated with methyimercuric chloride. Then, those who consumed the seafoods became extremely ill, and some died. By knowing the Minamata disease, the Japanese public became much more aware and deeply concerned about pollution caused by chemical industries. 

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