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Synthesis Gas and Derivatives

Courtesy of Sipchem, Methanol Plant

Acetic Acid Production Process (CT-ACETICA TM)

The CT-ACETICATM process, developed by Chiyoda, is a process to produce acetic acid by the carbonylation of methanol. With a unique line of technologies including high-performance resin-supported rhodium catalysts and bubble column loop reactors, the CT-ACETICATM process stands out from other similar processes.


High-Performance Resin-Supported Rhodium Catalyst

Rhodium complex is used as a catalyst for the carbonylation reaction of methanol. Conventionally, dissolving the Rh complex in the reactor requires large quantities of water. Consequently, the energy requirement for separation of water from the acetic acid product also goes up. To overcome these problems, Chiyoda Corporation has developed a thermostable vinylpyridine resin which can support the rhodium complex.Fixing the rhodium complex catalyst to the vinylpyridine resin exhibits the following advantages:

  • Without the solubility limitations, the amount of catalyst in the reactor can be raised to enhance the space-time yield (STY) of the carbonylation reaction.
  • The loss of rhodium by precipitation in the distillation section can be reduced, since the resin-supported rhodium catalyst remains in the reactor.
  • Since the amount of water is reduced to the minimum level required for the reaction, the refining cost of the produced acetic acid decreases, in addition to reduced by-product formation.

Bubble Column Loop Reactor Technology

The CT-ACETICATM process adopts a bubble column loop reactor designed for the effective usage of resin catalysts. As the carbon monoxide reactant gas is introduced and dispersed at the bottom of the reactor, small bubbles are formed. These bubbles efficiently contact and react with methanol and resin catalysts as they rise through the reactor.
The bubble column loop reactor has the following features:

  • High contact efficiency among the three phases: gas, liquid and solid
  • Airtightness is achieved, as there are no rotating elements. Resin erosion is also reduced.
  • Reaction heat is easily removed by installing a heat exchanger, thereby achieving more precise control of reaction temperature.

CT-ACETICATM Licensing by Chiyoda and KBR

The CT-ACETICATM process is now available for licensing by Chiyoda and KBR, our alliance partner and a leading technology company.