Method for separating and extracting hexanoic acid, heptanoic acid and octanoic acid from anaerobic acidification liquid of livestock and poultry manure
A technology of anaerobic acidification, livestock and poultry manure, applied in the separation/purification of carboxylic acid compounds, anaerobic digestion treatment, organic chemistry, etc.
Active Publication Date: 2020-07-07
INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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Problems solved by technology
[0004] Existing studies or patents mostly focus on the extraction process of a single medium-chain fatty acid caproic acid, but there are no related reports on the extraction process of obtaining high-purity caproic acid, heptanoic acid and caprylic acid from mixed fatty acids.
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Embodiment 1
[0030] This embodiment includes the following steps:
[0031] A. Solid-liquid separation: Centrifuge the anaerobic acidification solution of livestock and poultry manure containing medium-chain fatty acids at 4500rpm for 10-15min, and then pass through a 200um pore size stainless steel filter to remove large suspended particles and leave the supernatant.
[0032] B. Organic acid extraction: use hydrophobic methyl tert-butyl ether as the extractant, according to the supernatant: methyl tert-butyl ether mass ratio of 2:1, 5:1, 10:1, magnetic stirring for about 10min After being fully mixed, it is poured into a separatory funnel for liquid separation, the lower layer is the water phase, and the upper layer is the organic phase; the water phase is extracted repeatedly in this way for 3-4 times, and the organic phases obtained from each treatment are mixed separately to form an organic phase mixed solution. The extraction rates of organic acids treated with methyl tert-butyl ether ...
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The invention belongs to the field of organic acid separation methods, and particularly relates to a method for separating and extracting caproic acid, heptanoic acid and octanoic acid from an anaerobic acidized fluid of livestock and poultry excrements. The method comprises the following steps: A, solid-liquid separation; B, organic acid extraction; C, recovery of an extraction agent; and D, multistage vacuum rectification. According to the method for separating and extracting caproic acid, heptanoic acid and octanoic acid from the anaerobic acidized fluid of livestock and poultry excrements,large-particle suspended solids are removed by adopting solid-liquid separation, so extraction efficiency can be improved; mixed acid liquor obtained after solid-liquid separation does not need to besubjected to acid adjustment treatment and is directly extracted, and an extraction rate reaches 95% or above; a normal-pressure low-temperature distillation extraction agent recovery process is adopted, so volatilization of low-boiling-point short-chain organic acid is avoided, the temperatures of a tower kettle and a tower top are jointly controlled, and 92% or above of the extraction agent isefficiently recovered; high-purity hexanoic acid, heptanoic acid and octanoic acid can be respectively obtained through multi-stage reduced pressure rectification; the high-valued utilization of the medium-chain fatty acid-rich anaerobic acidized fluid of livestock and poultry excrements is achieved, and development and application of a biosynthesis process for medium-chain fatty acid are promoted.
Description
technical field [0001] The invention belongs to the field of organic acid separation methods, and in particular relates to a method for separating and extracting hexanoic acid, heptanoic acid and octanoic acid from anaerobic acidification liquid of livestock and poultry manure. Background technique [0002] The anaerobic digestion process of livestock and poultry manure can produce intermediate metabolites such as acetic acid, propionic acid, butyric acid and valeric acid. The elongation reaction (reverse β-oxidation process) converts some short-chain fatty acids into medium-chain fatty acids with high added value, and then obtains a mixed organic acid solution containing short-chain fatty acids and medium-chain fatty acids (Liang S, Wan C. Carboxylic acid production from brewer's spent grain via mixed culture fermentation.[J].BioresourceTechnology,2015,182:179-183.). Compared with short-chain fatty acids, medium-chain fatty acids have the following advantages: (1) long car...
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IPC IPC(8): C07C51/42C07C51/48C07C51/44C07C53/126C02F3/28C12P7/40
CPCC02F3/28C07C51/42C07C51/44C07C51/48C07C53/126C12P7/40
Inventor 张万钦董红敏尹福斌朱志平曹起涛
Owner INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI