Chemical Engineering
ACETIC ACID BY THE CHIYODA/UOP ACETICA™ PROCESS
Aspen Model Documentation
Index
• Process Summary
• About This Process
• Process Definition
• Process Conditions
• Physical Property Models and Data
• Chemistry/Kinetics
• Key Parameters
• Selected Simulation Results: Blocks
Streams
• References
PEP Process Module 1 19 Aug 1999
SRI Consulting
Process Summary
This Aspen Plus model simulates the production of acetic acid by low pressure methanol carbonylation in the presence of a heterogeneous rhodium (Rh) catalyst and the promoter methyl iodide. It is intended to resemble the Chiyoda/UOP Acetica™ process, a novel heterogeneous methanol process for the production of acetic acid. This technology is based on a heterogeneous Rh catalyst in which the active Rh complex is chemically immobilized on a polyvinylpyridine resin. In the Aspen Plus model, the plant (base case) is designed to produce 800 million lb/yr (363,000 t/yr) of acetic acid from methanol carbonylation. The process consists of both the carbonylation and purification sections. Results from the Aspen Plus simulation shows that the purity of acetic acid obtained is 98.4%. Vent gas (4,304 lb/hr) from two absorbers and heavy by-products (1,150 lb/hr) from the bottom of the heavy-ends stripper are sent to incinerator. The process also generates approximately 65,000 lb/hr of low-pressure (150 psig) steam that supplies a significant portion of the plant energy requirements.
PEP Process Module 2 19 Aug 1999
SRI Consulting
About This Process
Current global capacity for acetic acid exceeds 6.4 million t/yr. Downstream applications for the acid are primarily as a precursor for vinyl acetate monomer synthesis, for acetic anhydride production, and as a solvent in purified terephthalic acid production. Methanol carbonylation to produce acetic acid using a homogeneous Rh catalyst accounts for more than 55% of global capacity,
Aspen Model Documentation
Index
• Process Summary
• About This Process
• Process Definition
• Process Conditions
• Physical Property Models and Data
• Chemistry/Kinetics
• Key Parameters
• Selected Simulation Results: Blocks
Streams
• References
PEP Process Module 1 19 Aug 1999
SRI Consulting
Process Summary
This Aspen Plus model simulates the production of acetic acid by low pressure methanol carbonylation in the presence of a heterogeneous rhodium (Rh) catalyst and the promoter methyl iodide. It is intended to resemble the Chiyoda/UOP Acetica™ process, a novel heterogeneous methanol process for the production of acetic acid. This technology is based on a heterogeneous Rh catalyst in which the active Rh complex is chemically immobilized on a polyvinylpyridine resin. In the Aspen Plus model, the plant (base case) is designed to produce 800 million lb/yr (363,000 t/yr) of acetic acid from methanol carbonylation. The process consists of both the carbonylation and purification sections. Results from the Aspen Plus simulation shows that the purity of acetic acid obtained is 98.4%. Vent gas (4,304 lb/hr) from two absorbers and heavy by-products (1,150 lb/hr) from the bottom of the heavy-ends stripper are sent to incinerator. The process also generates approximately 65,000 lb/hr of low-pressure (150 psig) steam that supplies a significant portion of the plant energy requirements.
PEP Process Module 2 19 Aug 1999
SRI Consulting
About This Process
Current global capacity for acetic acid exceeds 6.4 million t/yr. Downstream applications for the acid are primarily as a precursor for vinyl acetate monomer synthesis, for acetic anhydride production, and as a solvent in purified terephthalic acid production. Methanol carbonylation to produce acetic acid using a homogeneous Rh catalyst accounts for more than 55% of global capacity,
References: 560988 Noriyuki, Y., et al. (to Chiyoda), “ Process for the Production of Acetic Acid from Methanol and Carbon Dioxide using Supported Rhodium Catalyst,” US 5,334,755, (April 21, 1993) 501931 Marston, C.R. et al. (to Reilly Tar & Chemical), “ Process for Acetic Acid Preparation and Heterogeneous Catalyst for Same,” European 277,824 (August 10, 1988) Reports Fong, W.S., Acetic Acid by Low Pressure Carbonylation of Methane with a Supported Rhodium Catalyst, PEP Review 88-3-4, Process Economics Program, SRI International, Menlo Park, California (February 1990) Ma, J.J.L., et al., Acetic Acid by Low Pressure Carbonylation of Methane, PEP Review 78-3-4, Process Economics Program, Stanford Research Institute, Menlo Park, California (January 1980) Takaoka, S., Acetic Acid and Acetic Anhydride, PEP Report 37A, Supplement A, Process Economics Program, Stanford Research Institute, Menlo Park, California (March 1973) Report by: Noni Lim August 19, 1999