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Method for separating sugar, acid and salt of lignocellulose hydrolysate

A technology of lignocellulose and hydrolyzate, applied in the chemical industry, can solve problems such as incomplete separation of sugar and acid, and achieve the effect of saving fermentation cost and simple and convenient recycling and utilization.

Active Publication Date: 2012-07-25
谷创芯生物科技(厦门)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the sugar-acid separation is not complete, and the residual sulfuric acid in the sugar liquid still needs to be neutralized by lime

Method used

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  • Method for separating sugar, acid and salt of lignocellulose hydrolysate
  • Method for separating sugar, acid and salt of lignocellulose hydrolysate
  • Method for separating sugar, acid and salt of lignocellulose hydrolysate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Put 125Kg of air-dried corncobs in a volume of 1M 3 In the hydrolysis tank, add 1.2% sulfuric acid solution to soak the material surface (acid liquid about 700Kg) and overflow from the top overflow pipe, close the overflow pipe outlet, make the pressure in the tank rise to 0.2Mpa, and maintain 1h, then from Drain the free acid from the bottom. The acid solution actually absorbed by the corn cob material in the pickling process is about 240Kg. After the acid liquid is drained, the hydrolysis kettle is directly fed with steam to be heated in the hydrolysis kettle. Under the condition of 0.2Mpa steam, the pressure is maintained for 1.5h, and the pressure is released instantly to spray out the material. The total weight of the sprayed material is 425kg, and the filtrate is squeezed to obtain 250kg. The residue is soaked with 130kg of water, squeezed again and 140kg of filtrate is collected. The two filtrates combined were 390kg in total, with a soluble solid content of 13...

Embodiment 2

[0060] Air-dried bagasse 90Kg, the loading volume is 1M 3 Carry out pickling treatment in the hydrolysis still, acid solution concentration, pickling treatment condition, hydrolysis condition are all with embodiment 1. During the pickling process, the bagasse actually absorbs about 270kg of acid solution, and the total weight of the sprayed material after hydrolysis is 330kg. Press filter the material to collect the hydrolyzate, add water to the residue to soak the surface of the material again, press again and collect the hydrolyzate. The combined hydrolyzate collected by pressing twice is 450Kg in total, the total solid content of this hydrolyzate is 7%, and the xylose content is about 30g / kg.

Embodiment 3

[0062] Prepared according to the conditions of Example 1, 1500Kg of corn cob dilute sulfuric acid hydrolyzate with 12% soluble content was concentrated to a total solid concentration of 45% under vacuum conditions of -0.09Mpa, and the evaporative condensate was collected; the concentrate was filtered to remove insolubles, to obtain Clarified concentrated hydrolyzate 350Kg. The concentrated hydrolyzate of corn cob contains about 350g / kg xylose, 48g / kg sulfate, and 10g / kg acetic acid.

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Abstract

The invention discloses a method for separating sugar, acid and salt of lignocellulose hydrolysate. The method comprises the following steps of: (1) utilizing inorganic acid to hydrolyze a hemicellulose part of a lignocellulose raw material, and performing solid-liquid separation, thereby obtaining the lignocellulose hydrolysate; (2) performing vacuum concentration on the lignocellulose hydrolysate, filtering and clearing a concentrate, re-crystallizing filtered remains so as to recycle potassium salt, performing sugar-acid-salt separation on the cleared filtrate, taking pure water as a flow phase to perform sugar-acid separation on the concentrated hydrolysate on a simulated moving bed filled with an H-type cation chromatographic column, and cutting by taking inorganic acid and salt as quick components and sugar and acetic acid as slow components during the separating process; (3) purifying and concentrating the quick component, complementing the concentration of acid by using fresh acid liquor for hydrolysis of the next batch of raw material; and (4) separating acetic acid from the slow component, thereby obtaining purified syrup. The method provided by the invention is used for separating the sugar, acid and salt of the lignocellulose hydrolysate.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to the separation and utilization method of sugar, acid and salt components in lignocellulose dilute acid hydrolyzate. Background technique [0002] Lignocellulose is a general term for a class of substances that are tightly combined with cellulose, hemicellulose and lignin through covalent or non-covalent bonds. It constitutes the main component of plant cell walls and is the most abundant available on earth. recycled resources. The hydrolyzate of cellulose and hemicellulose is fermentable reducing sugar, and fermentable syrup is prepared from lignocellulose, which is then fermented to produce fuel ethanol, xylitol, organic acid and other energy and basic organic chemical products, or directly produced by The preparation of high value-added product xylose from hydrolyzate is an important way to utilize plant fiber resources. [0003] Inorganic acid hydrolysis is a very traditional ...

Claims

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Application Information

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IPC IPC(8): B01D15/22C07H1/08C07H3/02C07C53/08C07C51/42
Inventor 张厚瑞刘婷婷王羽娟卢艺芳林卫军肖忠明
Owner 谷创芯生物科技(厦门)有限公司
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