Process system for dehydrogenation reaction of cyclohexanol by heating heat transfer oil with steam

Abstract

The invention provides a process system using steam to heat conduction oil for a dehydrogenation reaction of cyclohexanol. The process system comprises a steam heater, an expansion tank, an oil storage tank, a hot oil collection tank and an alcohol dehydrogenation reactor, wherein a conduction oil outlet of the alcohol dehydrogenation reactor is connected with a conduction oil inlet of the steam heater through a pipeline, and a conduction oil inlet of the alcohol dehydrogenation reactor is connected with a conduction oil outlet of the steam heater through a pipeline. By the process system, the temperature control stability of hot oil is improved, the energy utilization ratio is increased, a natural gas heating furnace is saved, and the purpose of reducing the heating cost is fulfilled.

Description

technical field [0001] The invention relates to a chemical production system, in particular to a process system for dehydrogenating cyclohexanol by heating heat-conducting oil with steam. Background technique [0002] Cyclohexanone is a very important chemical raw material. It is an intermediate in the production of adipic acid and caprolactam and has a wide range of uses. Cyclohexanone is an excellent solvent because of its high volatility and low solubility. It can dissolve polyvinyl acetate, digestive fiber, polymethyl methacrylate, polyurethane, alkyd resin, and acrylic resin. In addition, cyclohexanone also has irreplaceable uses in rubber, anti-aging agents and medicine. At present, the methods for producing cyclohexanone mainly include phenol hydrogenation method, cyclohexane liquid-phase oxidation method, and cyclohexene hydration method; each method involves the dehydrogenation reaction of cyclohexanol. [0003] For the heating system in the cyclohexanol dehydroge...

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Problems solved by technology

[0003] For the heating system in the cyclohexanol dehydrogenation reaction, natural gas or liquefied gas combustion furnaces are currently used in the industry to heat the circulating hot oil. Although this heating process is very mature, the waste heat of the exhaust gas after combustion in the combustion furnace is of low grade and has a recycling value. Small, most of them are directly discharged, resulting in energy waste. There are domestic processes to exchange heat between the exhaust gas after combustion and the air at the inlet of the combustion furnace to recover part of the waste heat, but the effect is limited

[0004] In addition, for the stable operation of the heating system, enterprises need to reserve a certain amount of natural gas or liquefied gas to cope with the storage and transportation cycle. The transportation, storage, and maintenance of storage tanks of natural gas and liquefied gas require additional costs every year, which will increase the production cost of the enterprise.

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