Method for preparing glycerin from byproduct in manufacture procedure of biodiesel

A biodiesel and by-product technology, applied in the separation/purification of hydroxyl compounds, organic chemistry, etc., can solve the problems of huge investment and low added value of end products, and achieve the effect of economical operation and easy operation

Inactive Publication Date: 2010-01-27
张伟民 +4
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although manufacturers with professional skills have provided technology to refine this crude glycerin to obtain refined glycerin, due to the huge investment, few manufacturers have made this investment; and most downstream manufacturers, after receiving these by-products After that, som

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  • Method for preparing glycerin from byproduct in manufacture procedure of biodiesel
  • Method for preparing glycerin from byproduct in manufacture procedure of biodiesel
  • Method for preparing glycerin from byproduct in manufacture procedure of biodiesel

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Embodiment Construction

[0035] Hereby the relevant technical content of the present invention is described as follows with accompanying drawings:

[0036] figure 1 It is a process schematic diagram of the present invention to prepare (pharmaceutical grade) glycerin from the by-product of the biodiesel process. As shown in the figure: the present invention is a method for preparing (pharmaceutical grade) glycerol from the by-products of the biodiesel process, including a process unit 100 for recyclable by-product pretreatment by converting the by-product of the esterification process, and a separation of the by-product Process unit 200, a thin film evaporation process unit 300 for recovering methanol, a crude glycerol mixture dehydration process unit 400, a molecular distillation process unit 500 for industrial-grade glycerin refining, and a molecular distillation process unit 600 for pharmaceutical-grade glycerin refining, for refining , industrial grade and pharmaceutical grade glycerin. The afore...

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Abstract

The invention discloses a method for preparing glycerin from a byproduct in a manufacture procedure of biodiesel, which comprises that: phosphoric acid is put into a phosphoric acid storage tank; the byproduct generated in the esterification manufacture procedure of the biodiesel is sent into a blending tank, and clear water in certain ratio is introduced to a temporary storage tank, and mixed and stirred with the byproduct in the esterification manufacture procedure; the stirred byproduct in the esterification manufacture procedure is sent into a homogenizer for conversion treatment through a delivery pump, and simultaneously the delivery pump is started; the phosphoric acid is sent into the homogenizer in specific ratio and is subjected to mixing and conversion with the byproduct in the esterification manufacture procedure, and a mixture of the byproduct in the esterification manufacture procedure after the mixing and conversion is temporarily placed in the material temporary storage tank; and the material in the material temporary storage tank is converted, sticky and thick non-esterified fatty acid, a particle crystalloid potassium phosphate compound, and farrago of liquid crude glycerine, water content and methanol are separated out, and the separated substances are subjected to three-phase separation by a three-phase centrifuge.

Description

technical field [0001] The invention relates to a method for preparing glycerin. Background technique [0002] The process of esterifying animal and vegetable oils to obtain biodiesel produces saponification by-products consisting of animal and vegetable gels, crude glycerin, free fatty acids, methanol (or ethanol), and potassium hydroxide. [0003] Although these saponification by-products have commercial value, if they cannot be handled in detail, they will cause certain harm to the environment. Generally, small and medium-sized biodiesel refineries do not have proper technology and equipment to deal with these by-products. Therefore, most of these by-products are sold at a price ranging from 200 to 250 US dollars per metric ton (the fourth quarter of 2007), and let downstream manufacturers handle them. [0004] Although manufacturers with professional skills have provided technology to refine this crude glycerin to obtain refined glycerin, due to the huge investment, fe...

Claims

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Application Information

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IPC IPC(8): C07C31/22C07C29/74
Inventor 张伟民
Owner 张伟民
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