Chiyoda process

Regenerable processes, as shown in Figure 5, utilize solutions of sodium sulfite or dilute sulfuric acid (Chiyoda Process) to absorb the sulfur dioxide by the following reactions ... 

Chiyoda Process [1137], In this process the traditional fired primary reformer is also replaced by an exchanger reformer and the heat balance requires excess air in the secondary reformer with the consequence of a cryogenic unit as final step in the makeup gas preparation to remove the surplus of nitrogen. Additionally, gas turbines are proposed as drivers for the process air compressor and synthesis gas compressor with the hot exhaust being used for steam generation and feed gas preheating. 

An alternative strategy, involving anchoring of the anionic rhodium catalyst to ion-exchange resins has also shown considerable potential in a Chiyoda process characterized by high catalytic activity and low water concentrations. 

CHIYODA thoroughbred 121 process forced oxidation lime spray drying... 

Advanced Cracking Reactor. The selectivity to olefins is increased by reducing the residence time. This requires high temperature or reduction of the hydrocarbon partial pressure. An advanced cracking reactor (ACR) was developed jointly by Union Carbide with Kureha Chemical Industry and Chiyoda Chemical Constmction Co. (72). A schematic of this reactor is shown in Figure 6. The key to this process is high temperature, short residence time, and low hydrocarbon partial pressure. Superheated steam is used as the heat carrier to provide the heat of reaction. The burning of fuel... 

Phenol was the 33rd highest-volume chemical. The 1994 U.S. production of phenol was approximately 4 billion pounds. The current world capacity is approximately 15 billion pounds. Many chemicals and polymers derive from phenol. Approximately 50% of production goes to phenolic resins. Phenol and acetone produce bis-phenol A, an important monomer for epoxy resins and polycarbonates. It is produced by condensing acetone and phenol in the presence of HCI, or by using a cation exchange resin. Figure 10-8 shows the Chiyoda Corp. bisphenol A process. 

Figure 10-8. The CT-BISA (Chiyoda Corp.) process for producing bis-phenol A from acetone and phenol. (1) reactor, (2-4) distillation columns, (5) phenol distillation column, (6) crystallizer, (7) solid/liquid separator, (8) prilling tower.

ABC Also called Chiyoda ABC. A process for treating heavy hydrocarbons from tar sands by hydrocracking. Piloted by the Chiyoda Chemical Engineering and Construction Company in the 1980s. 

ACR [Advanced Cracking Reactor] A thermal petroleum cracking process, the heat being provided by partial combustion of the feed at 2,000°C. Developed by Chiyoda Chemical Engineering Construction Company, Kureha Chemical Industry Company, and Union Carbide Corp. in the 1970s. A demonstration plant was operated in Seadrift, TX, from 1979 to 1981. 

AMV A modified process for making ammonia, invented by ICI and announced in 1982. It uses a new catalyst and operates at a pressure close to that at which the synthesis gas has been generated, thereby saving energy. Construction licenses have been granted to Chiyoda Corporation, Kvaeme, and Mannesman. In 1990 it was operated in the CIL plant in Ontario, Canada and then in Henan Province, China. 

CT-BISA [Chiyoda Thoroughbred bisphenol-A] A catalytic process for making Bisphenol-A from phenol and acetone. The catalyst is an acidic ion-exchange resin. The product is used for making polycarbonate resins. Developed and offered by Chiyoda Corporation, Japan. The first plant was operated in Tobata, Japan, in 1997. 

Z-forming A process for making aromatic hydrocarbons from aliphatic hydrocarbons. Developed jointly by Chiyoda and Mitsubishi Oil and operated in a demonstration plant in Kawasaki until it was closed in 1992. 

The ionic attachment strategy for catalytic methanol carbonylation has recently seen a resurgence of interest from both industry [49-53] and academic groups [54-57]. Most significantly, in 1998 Chiyoda and UOP announced their Acetica process, which uses a polyvinylpyridine resin tolerant of elevated temperatures and pressures [8,58]. The process attains increased... 

Watanabe, K Chiyoda, N., and Kawakami, T. (2008) Development of new isomerization process for petrochemical by-products. 18th Saudi Arabia-Japan Joint Symposium, Dhahran, Saudi Arabia, November 16-17, 2008. 

In 2001 DSM and Chiyoda were developing the ALTAM process. This process is based on butadiene and carbon monoxide and involves no byproducts. Production costs are expected to be US 1,300 per tonne ( 0.59/lb)26S. 

The Chiyoda/UOP ACETICA process for the production of acetic acid," 8th Annual Saudi-Japanese Symposium on Catalysts in Petroleum Refining and Petrochemicals, KFUPM-RI, Dhahran, Saudi Arabia, Nov. 29-30, 1998. 

Acetica A process for making acetic acid by the heterogeneous carbonylation of methanol in a bubble column reactor. The catalyst is a rhodium carbonyl iodide, anchored by ion-pairing to a polyvinyl pyridine resin. Developed by Chiyoda Corporation and UOP and first described in 1998. Licensed to Guizhou Crystal Organic Chemical Group, China, in 2002 one plant was under construction in 2005. 

ALTAM A process for making caprolactam from butadiene and carbon monoxide. Developed by DSM in the late 1990s and subsequently improved by Shell Chemicals, which contributed catalyst know-how. In the first two steps of the process, butadiene undergoes two hydroformylations with carbon monoxide, followed by reductive animation with ammonia and then cyclization to caprolactam. First commercialization was expected in Taiwan. A joint venture with Chiyoda Corporation, to further develop and commercialize the process, was announced in 2002. 

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