Dry dilute acid pretreatment method for lignocellulose raw material by using low-pressure steam heating

A low-pressure steam heating and lignocellulosic technology, applied in fermentation and other directions, can solve the problems of small-scale decentralized pretreatment plants, unsuitable for construction investment costs, large thermal power plants and high-pressure steam boilers, etc.

Pending Publication Date: 2018-10-23
SHANXI SYNTHETIC BIOLOGY INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The decentralized pretreatment plant has a small scale and is not suitable for building thermal power plants and high-pressure steam boilers with high investment costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 1200 g of dry corn stalks after dedusting and crushing and 600 g of dilute sulfuric acid with a mass fraction of 5% into a pretreatment reactor equipped with a ribbon-type stirring paddle, and stir for 3 minutes at a stirring speed of 50 rpm. Feed saturated steam with a saturated steam pressure of 1.5Mpa into the pretreatment reactor to perform dry dilute acid pretreatment, the reaction temperature is 175°C, and the reaction time is 5 minutes. Take out the material from the reactor and carry out the enzymatic hydrolysis test. The solid content of the enzymatic hydrolysis test is 2.5%, the temperature is 50 ° C, the stirring speed is 150 rpm, the amount of cellulase is 20 FPU / g DM, the glucose concentration is measured after 72 hours, and the cellulose is calculated. Conversion rate, the conversion rate of cellulose under this condition is 91.76%.

Embodiment 2

[0021] Add 1200 g of dry corn stalks after dedusting and crushing and 600 g of dilute sulfuric acid with a mass fraction of 5% into a pretreatment reactor equipped with a ribbon-type stirring paddle, and stir for 3 minutes at a stirring speed of 50 rpm. Pass saturated steam with a saturated steam pressure of 1.7Mpa into the pretreatment reactor to perform dry dilute acid pretreatment, the reaction temperature is 175°C, and the reaction time is 5 minutes. Take out the material from the reactor and carry out the enzymatic hydrolysis test. The solid content of the enzymatic hydrolysis test is 2.5%, the temperature is 50 ° C, the stirring speed is 150 rpm, the amount of cellulase is 20 FPU / g DM, the glucose concentration is measured after 72 hours, and the cellulose is calculated. Conversion rate, the conversion rate of cellulose under this condition is 97.88%.

Embodiment 3

[0023] Add 1200 g of dry corn stalks after dedusting and crushing and 600 g of dilute sulfuric acid with a mass fraction of 5% into a pretreatment reactor equipped with a ribbon-type stirring paddle, and stir for 3 minutes at a stirring speed of 50 rpm. Pass saturated steam with a saturated steam pressure of 1.9Mpa into the pretreatment reactor to perform dry dilute acid pretreatment, the reaction temperature is 175°C, and the reaction time is 5 minutes. Take out the material from the reactor and carry out the enzymatic hydrolysis test. The solid content of the enzymatic hydrolysis test is 2.5%, the temperature is 50 ° C, the stirring speed is 150 rpm, the amount of cellulase is 20 FPU / g DM, the glucose concentration is measured after 72 hours, and the cellulose is calculated. Conversion rate, the conversion rate of cellulose under this condition is 98.86%.

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Abstract

The invention discloses a dry dilute acid pretreatment method for a lignocellulose raw material by using low-pressure steam heating. The method concretely comprises the following steps: (1) preprocessing the lignocellulose raw material; (2) carrying out dry dilute acid pretreatment on the lignocellulose raw material obtained in step (1), wherein the heating steam in the pretreatment step is low-pressure saturated vapor with the pressure being 1.0-2.1 MPa; and (3) subsequently biologically processing the pretreated lignocellulose raw material obtained in step (2). The method has the following advantages: the dry dilute acid pretreatment using low-pressure steam heating ensures the pretreatment effect; the pressure of the heating steam is low, so the device investment of a steam boiler is greatly reduced; and additionally, the low-pressure steam has a high steam feeding rate, so mixing and heat transfer in the pretreatment process are enhanced, and inhibitors generated in the pretreatment process are effectively reduced. The dry dilute acid pretreatment using the low-pressure steam heating lays a foundation for a small distributed pretreatment-large centralized biological refining mode.

Description

【Technical field】 [0001] The invention relates to the field of lignocellulose biorefining, and relates to a dry-process dilute acid pretreatment method for lignocellulose raw materials heated by low-pressure steam. 【Background technique】 [0002] Pretreatment is a necessary step to destroy the structure of lignocellulosic raw materials and improve the efficiency of subsequent cellulose enzymatic hydrolysis in the process of producing biofuels and biobased chemicals through biorefinery. At present, there are many pretreatment methods, such as dilute acid pretreatment, steam explosion pretreatment, ammonia fiber explosion pretreatment, alkali pretreatment and ionic liquid pretreatment, etc., and in almost all of these pretreatment methods, temperature is an influence The key factor of pretreatment effect. Generally speaking, relatively higher temperature can obtain better pretreatment effect. [0003] At present, the heating methods used for pretreatment heating mainly inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P19/02
CPCC12P19/02C12P19/14C12P2201/00
Inventor 鲍杰邵帅张建
Owner SHANXI SYNTHETIC BIOLOGY INST CO LTD
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