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Gas treatment method in a kind of biodiesel esterification reaction

An esterification reaction and gas treatment technology, applied in the field of biodiesel, can solve the problems of large methanol loss, high equipment requirements and high consumption, and achieve the effects of low waste water treatment cost, high methanol content and small rectification loss

Active Publication Date: 2019-03-19
SICHUAN LANBANG NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the waste liquid contains a large amount of sulfuric acid or phosphoric acid, which belongs to hazardous waste water, the treatment is difficult and the consumption is high. At the same time, the existence of sulfuric acid in the whole process leads to high equipment requirements. The storage tanks need to be made of stainless steel, and the pumps need to use magnetic pumps. It leads to high investment required for the project; the methanol obtained by rectification is acidic and is not suitable for transesterification reaction. The concentration of methanol during rectification is low, the consumption of rectification is large, and the loss of methanol is large. Generally speaking, rectification wastewater contains 5~ 7% methanol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: a kind of gas treatment method in biodiesel esterification reaction comprises the following steps:

[0020] ① Gas alkalization: Spray the gas with potassium hydroxide solution to make the gas pH ≥ 9;

[0021] ②Condensation: the alkalized gas is condensed and enters the storage tank;

[0022] ③Batching: The liquid in the storage tank enters the batching tank to mix with sodium hydroxide and potassium hydroxide to get the circulating lye, and the pH of the circulating lye is ≥ 10;

[0023] ④Circulation: use circulating lye to replace the original lye in step ① and repeat steps ①—③1 time;

[0024] ⑤ Methanol rectification: After one cycle, when the methanol content in the storage tank liquid is ≥ 65wt%, methanol rectification is performed on the storage tank liquid to obtain methanol and wastewater.

[0025] After inspection, methanol was found to be weakly alkaline, and the main component in the wastewater was sodium sulfate, and the content of methanol wa...

Embodiment 2

[0026] Embodiment 2: a kind of gas treatment method in biodiesel esterification reaction comprises the following steps:

[0027] ① Gas alkalization: Spray the gas with a mixture of potassium hydroxide solution and potassium hydroxide solution to make the gas pH ≥ 9;

[0028] ②Condensation: the alkalized gas is condensed and enters the storage tank;

[0029] ③Batching: the liquid in the storage tank enters the batching tank and mixes with sodium hydroxide to get the circulating lye, and the pH of the circulating lye is ≥ 10;

[0030] ④ circulation: adopt circulating lye to replace the original lye in step ① and repeat steps ①—③ 3 times;

[0031] ⑤ Methanol rectification: After 3 cycles, when the methanol content in the storage tank liquid is ≥ 75wt%, methanol rectification is performed on the storage tank liquid to obtain methanol and wastewater.

[0032] After inspection, methanol is weakly alkaline, and the main component in the wastewater is sodium sulfate, and the content...

Embodiment 3

[0033] Embodiment 3: a kind of gas treatment method in biodiesel esterification reaction comprises the following steps:

[0034] ① Gas alkalization: Spray the gas with sodium hydroxide solution to make the gas pH ≥ 9;

[0035] ②Condensation: the alkalized gas is condensed and enters the storage tank;

[0036] ③Batching: the liquid in the storage tank enters the batching tank and mixes with sodium hydroxide to get the circulating lye, and the pH of the circulating lye is ≥ 10;

[0037] ④ circulation: adopt circulating lye to replace the original lye in step ① and repeat steps ①—③ multiple times;

[0038] ⑤ Methanol rectification: After multiple cycles, when the methanol content in the storage tank liquid is ≥ 75wt%, methanol rectification is performed on the storage tank liquid to obtain methanol and wastewater.

[0039] After inspection, methanol is weakly alkaline, and the main component in the wastewater is sodium sulfate, and the content of methanol is 0.5wt%.

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PUM

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Abstract

The invention relates to the field of biodiesel, in particular to a method for treating acid methanol gas in biodiesel esterification reaction. The method includes that gas is subjected to alkalization, condensation, compounding, circulation and methanol rectification sequentially. The method for treating the acid methanol gas in the biodiesel esterification reaction has the advantages that the method is used for treating the mixed gas in the esterification reaction, so that the problem of corrosion of acid serving as a catalyst to equipment in a subsequent treatment process is solved effectively, original stainless steel tanks are replaced by common ordinary carbon steel tanks and original magnetic force pumps are replaced by conventional pumps, and more than 4 / 5 of original investment cost is reduced; the rectified methanol showing alkaline can be used for subsequent transesterification and is stored in the tanks; wastewater obtained after rectification is conventional wastewater containing sodium sulfate and not more than 1 wt% of methanol, thereby being convenient to treat and low in treatment cost; after multiple times of circulation, high methanol content, little rectification loss and less energy consumption are achieved.

Description

technical field [0001] The invention relates to the field of biodiesel, in particular to a treatment method for acidic methanol gas in biodiesel esterification. Background technique [0002] Biodiesel is a clean and renewable energy source. It is a kind of diesel (liquid fuel) processed from biomass resources as the raw material. The main chemical component is fatty acid methyl ester. Specifically, animal and vegetable oils, such as rapeseed oil, soybean oil, peanut oil, corn oil, rice bran oil, cottonseed oil; and acidified oils and fatty acids from animal and vegetable oil leftovers; animal oils: lard oil, chicken oil, duck oil, animal bone oil After a series of chemical transformations, the refined liquid fuel is a high-quality substitute for petroleum diesel. Biodiesel is a typical "green energy". Vigorously developing biodiesel is of great strategic significance to sustainable economic development, promotion of energy substitution, reduction of environmental pressure, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/72B01D53/40B01D53/00C07C29/80C07C31/04
CPCB01D53/002B01D53/40B01D53/72B01D53/78B01D2251/304B01D2251/306B01D2251/604C07C29/80C07C31/04
Inventor 陈波
Owner SICHUAN LANBANG NEW ENERGY TECH CO LTD