Four-tower rectifying method for producing biodiesel from waste grease

A technology for biodiesel and waste oil, applied in the field of four-column rectification, can solve the problems of high requirements, unsatisfactory product quality, unsatisfactory biodiesel purity, etc., and achieve the effect of enhancing competitiveness and strong competitiveness.

Active Publication Date: 2015-06-17
DANYANG TONGTAI CHEM MACHINERY
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Problems solved by technology

Since domestic biodiesel companies mostly use a single distillation technology and equipment to separate crude methyl esters, the product quality cannot meet the BD100 standard, and the marketing is affected to a certain extent.
The use and chemical industry have high requirements on the purity of biodiesel (fatty acid methyl ester). The existing process only meets the pressure of using biodiesel as fuel oil, but cannot meet the purity required for the use of biodiesel as a chemical raw material. Therefore, four Column rectification technology and equipment can realize subdivision and refinement of crude methyl ester, meeting the index of chemical raw materials

Method used

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Embodiment 1

[0020] A four-tower rectification method for producing biodiesel from waste oil, comprising the following steps:

[0021] Step 1: Continuously enter the reacted crude methyl ester into the first tower for rectification to produce C14 and light component fatty acid methyl ester; heat the reacted crude methyl ester to 190-200°C with heat conduction oil before entering the second column One tower, in the first tower, a forced circulation pump is used for circulation heating, and the temperature inside the tower is controlled at 215-225°C; in the first tower, the content of C14 and light components in the crude methyl ester and the content of C16 in the output are controlled Output, ensure that the content of C14 in the first tower is less than 0.5%, and the content of C16 in the output of C14 and light components is less than 2%. According to the characteristics of waste oils and fats in my country, the ratio of C14 and light components to the crude methyl ester is 1-4%, so cooli...

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Abstract

The invention discloses a four-tower rectifying method for producing biodiesel from waste grease. The four-tower rectifying method comprises the following steps: (1), continuously putting reacted coarse methyl ester in a first tower to rectify so as to produce C14 and light-component fatty acid methyl ester; (2), continuously putting coarse methyl ester passing through the first tower in a second tower to rectify so as to produce C16 fatty acid methyl ester; (3), continuously putting coarse methyl ester passing through the second tower in a third tower to rectify so as to produce C18 fatty acid methyl ester; and (4), continuously putting coarse methyl ester passing through the third tower in a fourth tower to rectify so as to produce C18 fatty acid methyl ester and C20 fatty acid methyl ester. According to the four-tower rectifying method disclosed by the invention, reacted coarse methyl ester is rectified through the four towers; therefore, high-purity C16 fatty acid methyl ester and C18 fatty acid methyl ester can be obtained; and the four-tower rectifying method completely accords with production requirements of chemical products.

Description

technical field [0001] The invention relates to a four-tower rectification method for producing biodiesel from waste oil. Background technique [0002] Biodiesel is a green and environmentally friendly biomass energy. It has been used as fuel oil and petrochemical fuels in my country for more than 10 years. The quality requirements are different from those used for fuel. Since domestic biodiesel companies mostly use a single distillation technology and equipment to separate crude methyl esters, the product quality cannot meet the BD100 standard, and the marketing is affected to a certain extent. The use and chemical industry have high requirements on the purity of biodiesel (fatty acid methyl ester). The existing process only meets the pressure of using biodiesel as fuel oil, but cannot meet the purity required for the use of biodiesel as a chemical raw material. Therefore, four Column rectification technology and equipment can realize subdivision and refinement of crude me...

Claims

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Application Information

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IPC IPC(8): C11B3/12C10L1/02
CPCC10L1/02C10L2290/543C11B3/12Y02E50/10
Inventor 柏兆钰汪根钟汪文辉吴夫根王丽霞
Owner DANYANG TONGTAI CHEM MACHINERY
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