Process for preparing ethanol from acid out filtrate of slurrying black liquor
A technology for pulping black liquor and filtrate, which is applied in the chemical industry and can solve problems such as no precedent for use
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Embodiment 1
[0020] The filtrate produced during the acid analysis of black liquor is used, the acid content is 3%, the appearance is clear and transparent, and the pH value is 1.5.
[0021] Purify the wheat bran produced in the wheat straw pulping process to remove impurities such as wheat grains, sandstones, mud, dust, etc., so that the maximum diameter of the wheat straw section is 1.5-2cm.
[0022] The acid analysis filtrate obtained from pulping black liquor and wheat bran are mixed evenly according to the weight ratio of 6:1, the water content is controlled at 10%, hydrolyzed at 120°C for 3 hours, and the supernatant and fiber residue are separated after standing; Milk adjusts the pH value of the supernatant to 5, enters the fermenter and stirs at a stirring speed of 80 rpm, inserts Saccharomyces cerevisiae AS2.23 under stirring for fermentation, the fermentation temperature is 40°C, and the fermentation time is 55 hours. Fermentation broth with an ethanol content of 6%;
[0023] Th...
Embodiment 2
[0026] The filtrate produced during the acid analysis of the black liquor is used, the acid content is 4%, the appearance is clear and transparent, and the pH value is 1.5.
[0027] Purify the wheat bran produced in the wheat straw pulping process to remove impurities such as wheat grains, sand, mud, dust, etc., so that the maximum diameter of the wheat straw section does not exceed 2cm.
[0028] The acid analysis filtrate obtained from pulping black liquor and wheat bran are mixed evenly according to the weight ratio of 8:1, the water content is controlled at 20%, hydrolyzed at 100°C for 5 hours, and the supernatant and fiber residue are separated after standing; The milk adjusts the pH value of the supernatant to 6, enters the fermenter and stirs at a stirring speed of 100 rpm, inserts Saccharomyces cerevisiae AS 2.242 under stirring for fermentation, the fermentation temperature is 50°C, and the fermentation time is 45 hours to obtain ethanol The fermented liquid with a con...
Embodiment 3
[0030] The filtrate produced during the acid analysis of the black liquor is used, the acid content is 4%, the appearance is clear and transparent, and the pH value is 1.5.
[0031] Purify the wheat bran produced in the wheat straw pulping process to remove impurities such as wheat grains, sand, mud, dust, etc., so that the maximum diameter of the wheat straw section does not exceed 2cm.
[0032] Mix the acid analysis filtrate obtained from pulping black liquor with wheat bran evenly in a weight ratio of 7:1, control the water content at 16%, hydrolyze at 110°C for 4 hours, and separate the supernatant and fiber residue after standing; use lime The milk adjusts the pH value of the supernatant to 6, enters the fermenter and stirs at a stirring speed of 100 rpm, inserts Saccharomyces cerevisiae AS2.241 under stirring for fermentation, the fermentation temperature is 45°C, and the fermentation time is 50 hours, and the obtained A fermented liquid with an ethanol content of 7.6%; ...
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