Device for producing biodiesel through continuous ester interchange

Abstract

The invention discloses a device for producing biodiesel through continuous ester interchange. A spiral channel is arranged in a static mixer to uniformly mix materials. A discharge opening of the static mixer is connected with a feed opening of a first reaction kettle. A stirrer and a steam heating coil are arranged in the kettle. A discharge opening at the bottom of the kettle is connected with a feed opening of a first precipitation kettle, and a partition plate is arranged in the center in the precipitation kettle to enable the materials to flow in a U shape in the kettle. A discharge opening of the precipitation kettle is connected with a feed opening of a second reaction kettle. A stirrer and a steam heating coil are arranged in the second reaction kettle, and a discharge opening of the reaction kettle is connected with a feed opening of a buffer kettle. The buffer kettle enables a pump to operate stably, and a discharge opening of the buffer kettle is connected with an inlet of the pump. An outlet of the pump is connected with a feed opening of a flash evaporator, and multiple layers of sieve plates are arranged in the flash evaporator to improve the methanol evaporation effect. A gas-phase methanol outlet in the top of the flash evaporator is connected with a vacuum pump, a discharge opening of the flash evaporator is connected with a feed opening of a second precipitation kettle, and a partition plate is arranged in the center in the kettle to enable materials to flow in a U shape in the kettle. The device is simple in structure, low in manufacturing and maintenance cost, convenient and efficient to operate and high in ester exchange conversion rate.

Description

technical field [0001] The invention relates to the technical field of biodiesel production equipment, in particular to a device for producing biodiesel through continuous transesterification. Background technique [0002] The raw material oil used in the production of biodiesel by transesterification mainly includes oil or waste oil after removing free fatty acids, and waste oil is mainly used in China. Waste oil is mainly composed of free fatty acids and triglycerides, which contain a small amount of impurities such as water and sludge. Most of the impurities such as water and sludge in waste oil can be removed by heating, sedimentation and separation. Biodiesel and water are generated through the reaction of methanol with free fatty acids in waste oil, and then the waste oil after water removal is transesterified with excess methanol to generate biodiesel and glycerin. That is to say, what the transesterification reaction uses is the waste oil after free fatty acid has b...

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Problems solved by technology

Among them, the reaction kettle method is intermittent production, which has defects such as unstable product quality, low production efficiency, low automation control level, and high labor intensity; the reaction tower method uses medium-high temperature and medium-high pressure technology, and its disadvantages are large equipment investment and energy consumption. High, high operation requirements, and due to the medium and high temperature process, some waste oils are polymerized and decomposed, and the production conversion rate is low; the biological enzymatic method has the disadvantages of long reaction time, high enzyme price, easy poisoning and inactivation of the enzyme, high production cost and low product quality. The acid value is difficult to meet the national standard, etc.

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