Application and Market of 1,4-butanediol Production of Reppe Method in China
Issue:
Volume 9, Issue 2, March 2021
Pages:
34-38
Received:
21 December 2020
Accepted:
9 March 2021
Published:
17 March 2021
Abstract: The industrial production methods of 1,4-butanediol (BDO) are: maleic anhydride method (Davy-McKee), butadiene-acetic acid method (Mitsubishi Chemical), propylene oxide method (Lyondell), Reppe method, etc. Among these methods, only the Reppe process has achieved rapid development in China, with capacity far exceeding that of other petrochemical feedstock methods, because China has abundant mineral resources (e.g., coal and calcium carbide) where cheap feedstock is available for the production of 1,4-butanediol. There are three key steps in the production of 1, 4-butynediol by the Reppe method (methanol oxidation, alkynylation of formaldehyde and acetylene, and hydrogenation of 1, 4-butynediol). In recent years, Chinese enterprises have continuously explored and optimized these technologies introduced from abroad, and made some progress in process, equipment, catalyst, environmental protection and other related application technologies, which has promoted the technological progress of the industry. The latest statistical analysis is made on the application and market status of Reppe process for 1,4-butanediol production in China, and some opinions are put forward for the development of enterprises and 1,4-butanediol industry in the future, hoping to provide meaningful reference for the development of industry.
Abstract: The industrial production methods of 1,4-butanediol (BDO) are: maleic anhydride method (Davy-McKee), butadiene-acetic acid method (Mitsubishi Chemical), propylene oxide method (Lyondell), Reppe method, etc. Among these methods, only the Reppe process has achieved rapid development in China, with capacity far exceeding that of other petrochemical fe...
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Composite Pyrolysis of Biomass and Plastic for High-quality Fuel Oil over HZSM-5
Issue:
Volume 9, Issue 2, March 2021
Pages:
39-46
Received:
15 April 2021
Published:
24 May 2021
Abstract: Catalytic co-pyrolysis of biomass and plastic is a promising technology to their resource recovery and energy conversion. For the traditional technologies, the two feedstocks are mechanically mixed (MM) to the co-conversion reaction. However, there are disadvantages in the MM mode process, such as mixing nonuniformity and inconvenient transportation of feedstocks, poor heat and mass transfer during pyrolysis and low yield of effective products. To solve the above issues, a composite pyrolysis of biomass and plastic for high-quality fuel oil was innovatively studied in this paper at a lab-scale fixed bed reactor using HZSM-5 as a catalyst. Through procedures including mechanical mixing, hot pressing and crushing granulation, a composite molding (CM) sample was prepared. Then the optimal conditions for fuel oil production of the CM sample were explored, and under which conditions products distribution were compared with pyrolysis from the common MM sample. And possible mechanism for high-quality fuel oil generation of the composite pyrolysis was put forward through characterization of sample properties. Results show that, under the optimal reaction conditions of the composite pyrolysis, the yield of fuel oil was increased by 34.8% and the yield of aromatics was increased by 50.7% compared with the conventional pyrolysis from MM sample. Advantages of the composite pyrolysis could be explained by the enhanced contact between biomass and plastic particles, which promoted a stronger synergy between the two derived intermediates and effectively improved mass and heat transfer during pyrolysis process.
Abstract: Catalytic co-pyrolysis of biomass and plastic is a promising technology to their resource recovery and energy conversion. For the traditional technologies, the two feedstocks are mechanically mixed (MM) to the co-conversion reaction. However, there are disadvantages in the MM mode process, such as mixing nonuniformity and inconvenient transportatio...
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