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Process for recycling excessive methyl alcohol in biodiesel production process

A biodiesel and production process technology, applied in the field of chemical engineering, can solve the problems affecting the conversion rate of esterification, waste product quality of methanol, waste of environmental protection pressure, etc., and achieve high energy utilization efficiency, thorough and reliable recovery, and complete recovery. Effect

Inactive Publication Date: 2013-06-19
SHAANXI DERONG NEW ENERGY
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Problems solved by technology

[0007] In the existing biodiesel production technology, methanol is usually not recovered, resulting in waste of methanol and abnormal product quality; some use direct steam single-column distillation for reference on the recovery technology of ethanol, which has high energy consumption and high concentration of methanol in the waste at the bottom of the tower. Severe waste and environmental protection pressure, the quality of recovered methanol is low, and recycling affects the conversion rate of esterification and transesterification

Method used

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  • Process for recycling excessive methyl alcohol in biodiesel production process

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the examples, and the percentage concentration involved is the mass percentage concentration. The main equipment contacting methanol is all made of 304 stainless steel; the rectification section of the rectification tower is made of high-efficiency structured corrugated packing 250Y, made of 316 stainless steel; the stripping section of the rectification tower and the negative pressure flash tower are made of DN40 Pall ring packing, made of 316 stainless steel .

[0025] Such as figure 1 Shown, specifically, processing step of the present invention is as follows:

[0026] In the first step, the waste methanol produced by the biodiesel production line is condensed into a liquid phase and stored in a dedicated waste methanol storage tank 7;

[0027] The gaseous methanol leaving the reactor with water in the esterification reaction turns into a liquid phase after exchanging heat with the feed metha...

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Abstract

The invention discloses a process for recycling excessive methyl alcohol in a biodiesel production process. The process comprises the following process steps of: pumping waste methyl alcohol generated by a biodiesel production line into a negative-pressure flash tower; preliminarily concentrating methyl alcohol to prepare crude methyl alcohol; pumping crude methyl alcohol to a rectifying tower; and preparing qualified fine methyl alcohol for being reused in the production. According to the process for recycling excessive methyl alcohol in the biodiesel production process disclosed by the invention, waste methyl alcohol generated by the biodiesel production line is sufficiently recycled for being reused in the production, and therefore, the process is energy-saving and efficient, and economical and remarkable in technical effect; and moreover, thorough recovery and reliable quality are ensured by the double-tower distillation, the energy using efficiency is high, the exhausted waste is clean and the environmental protection is facilitated.

Description

technical field [0001] The invention relates to a recovery and regeneration process of excess methanol in the biodiesel production process, which belongs to the technical field of chemical engineering. Background technique [0002] Biodiesel is a fatty acid monoalkyl ester obtained by transesterification of animal and vegetable oils and alcohols (such as methanol or ethanol). The most typical one is fatty acid methyl ester, represented by BD100, and the national standard GB / T 20828-2007 is implemented. Biodiesel blended fuel (B5) implements the national standard GB / T 25199-2010. Biodiesel is an excellent supplement and substitute for petrochemical diesel. [0003] During the development of biodiesel, there were production methods such as direct mixing method, microemulsion method, pyrolysis method and transesterification method. The direct mixing and microemulsification methods are mixing animal and vegetable oils into petrochemical diesel oil without changing the chemical...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/80
Inventor 姚东阳陈涛高静
Owner SHAANXI DERONG NEW ENERGY
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