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Gas-phase methanol grading recovery process in biodiesel acid-base two-step method

A biodiesel, gas-phase methanol technology, applied in the fields of biofuels, fractionation, separation methods, etc., can solve the problems of high energy consumption and high investment in gas-phase methanol recovery equipment, and achieve the goal of reducing processing capacity, avoiding repetitive labor, and reducing equipment specifications. Effect

Pending Publication Date: 2021-12-28
HENAN HI TECH KINGDO IND COMPANY
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Problems solved by technology

[0006] The purpose of the present invention is to provide a gas-phase methanol classification recovery process in a biodiesel acid-base two-step method, to solve the problem of high investment in gas-phase methanol recovery equipment in the existing biodiesel acid-base two-step method proposed in the background technology high consumption problem

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  • Gas-phase methanol grading recovery process in biodiesel acid-base two-step method

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

[0024] see figure 1 Shown, in a kind of biodiesel acid-base two-step process, gas-phase methanol fractional recovery process, described process comprises the following steps:

[0025] Step a: use the first condenser 4 to condense the release gas generated at the gas phase outlet of the esterification tank 33, so that the gas phase methanol is condensed into liquid.

[0026] Step b: Analyze and determine the concentration of methanol in the condensate through the online moisture analyzer 5. In step b, the condensate is obtained by condensing the purge gas in step a, and the condensate is classified and stored in low-concentration methanol tanks according to the concen...

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Abstract

The invention discloses a gas-phase methanol grading recovery process in a biodiesel acid-base two-step method, and relates to the technical field of gas-phase methanol recovery. The process comprises the steps of condensing purge gas generated at a gas-phase outlet of an esterification kettle through a first condenser; analyzing and determining the concentration of methanol in the condensate through an on-line moisture meter, and then performing classified collection; feeding the low-concentration methanol in a low-concentration methanol tank into a methanol rectification system for rectification to obtain high-concentration methanol; and directly recycling the high-concentration methanol in the high-concentration methanol tank, that is, introducing the high-concentration methanol into the methanol gasifier to be gasified, and then entering the esterification kettle. According to the gas-phase methanol grading recovery process in the biodiesel acid-base two-step method, on the one hand, the treatment capacity of a methanol rectification system is reduced, so that the equipment specification of the methanol rectification system is reduced, and the investment is reduced; and on the other hand, repeated labor is avoided, and the methanol rectification energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of gas-phase methanol recovery, in particular to a gas-phase methanol fractional recovery process in a biodiesel acid-base two-step method. Background technique [0002] In the biodiesel acid-base two-step process, the process route of gas-phase methanol esterification to reduce the acid value of raw oil is generally used, and the flow rate of methanol is 0.5~1.2m 3 / h, the esterification reaction time is usually 4~6h. The characteristics of the esterification reaction are: 1~2 hours after the start of the reaction, the reaction rate is fast, and the acid value is quickly reduced to below 10mgKOH / g, that is, the water content of the recovered methanol is relatively high. After that, the concentration of methanol continues to increase, and even reaches as high as 98%. [0003] At present, the conventional operation is to collect all the methanol in different reaction time periods and then enter the rectific...

Claims

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Application Information

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IPC IPC(8): B01D5/00B01D3/14B01J19/18C11C3/00
CPCB01D5/006B01D3/14B01J19/18C11C3/003Y02E50/10
Inventor 张少敏王琦娄源民
Owner HENAN HI TECH KINGDO IND COMPANY
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