Alternate series reaction units for biodiesel production using high-pressure gas-phase methanol

Abstract

The invention discloses an alternating serial reaction device for producing biodiesel from high-pressure gas-phase methanol. The device comprises a first-stage reaction mechanism and a second-stage reaction mechanism. In each reaction mechanism, a discharge opening of a reactor is communicated with an inlet of a circulation pump through a grease outlet pipeline, an outlet of the circulation pump is communicated with a material circulation feeding pipe and the reactor to the position below a methanol uniform distributor, a high-pressure methanol main gas inlet pipeline is communicated with a grease inlet pipeline, and a high-pressure gas-phase methanol auxiliary gas inlet pipeline is led to the methanol uniform distributor on the lower portion of the reactor through a built-in reactor top gas inlet pipe. Methanol outlet pipelines are communicated with the high-pressure methanol auxiliary gas inlet pipelines through the methanol circulation pipelines between the first-stage reaction mechanism and the second-stage reaction mechanism. The fixed parallel-connection and non-fixed serial reaction device is formed and provided with a dual-effect stirring system and is high in production efficiency, redundant methanol of the first-stage reaction mechanism can be fully used for second-stage reaction, methanol consumption of a reaction system is remarkably reduced, methanol circulation volume is reduced, and energy consumption is reduced.

Description

technical field [0001] The invention relates to organic chemical production equipment, in particular to a reaction device for producing biodiesel by using high-pressure gas-phase methanol alternately and in series. Background technique [0002] With the rapid development of social economy, petroleum energy is facing an unprecedented crisis. In the process of searching for new energy, biodiesel, as a new type of energy, has attracted widespread attention. [0003] At present, the main method of biodiesel production is esterification and transesterification, that is, the esterification and transesterification of animal and vegetable oils or waste oils and low-carbon alcohols such as methanol (mainly using acid or alkali as a catalyst) to generate fatty acid methyl esters, namely biological diesel fuel. [0004] The esterification process is mainly in the form of continuous or batch reaction, and the use of batch reaction is more common because of the small investment in equip...

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Problems solved by technology

The batch reaction is mainly operated independently by tank reactors, and each tank is reacted with an excess alcohol-oil ratio, and the excess methanol vapor often directly enters the methanol rectification recovery device; on the one hand, each reactor independently carries out the esterification reaction. Although the purity of excess methanol in the later stage of chemical reaction is high, there is no secondary utilization of excess methanol, and the utilization rate of methanol in the reaction process is low, which not only increases the load of methanol recovery device, but also increases the volatilization loss in the process of methanol recovery; on the other hand, excess methanol The steam is purified and condensed and then recycled. Methanol undergoes multiple phase transitions, resulting in a large amount of methanol circulation, high energy consumption of the reaction heating system, and increased production costs.

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