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A method for preparing glucose and gallic acid by hydrothermally hydrolyzing tannin extract

A technology of gallic acid and glucose, applied in the field of chemical engineering, can solve the problems of environmental pollution equipment, corrosion, etc., and achieve the effect of high economic value

Active Publication Date: 2018-09-14
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing glucose and gallic acid by hydrothermally hydrolyzing tannin extract to overcome the environmental pollution and equipment corrosion problems caused by acid hydrolysis of tannin extract, which belongs to the field of chemical engineering

Method used

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  • A method for preparing glucose and gallic acid by hydrothermally hydrolyzing tannin extract

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Effect test

Embodiment 1

[0026] The method for preparing glucose and gallic acid by hydrothermally hydrolyzing tannin extract in this embodiment comprises the following steps:

[0027] (1) Weigh 1 kg of tannin extract in a rubber bowl, add it to 10 L of water, stir and react for 0.5 h at a temperature of 120 °C and a pressure of 0.1 Mpa, and cool the reaction solution to room temperature;

[0028] (2) filtering the reaction solution described in step (1);

[0029] (3) The filtrate described in step (2) is neutralized with clarified lime water to generate a precipitate, which is filtered to obtain a solution and a precipitate;

[0030] (4) The filtrate described in step (3) is concentrated to 30% by three-effect downstream evaporation;

[0031] (5) The concentrated solution described in step (4) is centrifugally spray-dried to obtain glucose with a yield of 10% and a purity of 75%;

[0032] (6) acidify the precipitate described in step (3) with 0.1M dilute sulfuric acid solution, and then use CaCO 3...

Embodiment 2

[0036] The method for preparing glucose and gallic acid by hydrothermally hydrolyzing tannin extract in this embodiment comprises the following steps:

[0037] (1) Weigh 1kg of Huaxiangguo extract, add it to 25L of water, stir and react at a temperature of 240°C and a pressure of 2.8Mpa for 2.0h, and cool the reaction solution to room temperature;

[0038] (2) centrifuging the reaction solution described in step (1) for 20 min at a rotating speed of 1000 rpm / min;

[0039] (3) neutralize the centrifuged liquid described in step (2) with clarified lime water to generate a precipitate, and centrifuge for 20 min at a rotating speed of 1000 rpm / min to obtain a solution and a precipitate;

[0040] (4) The centrifugal liquid described in step (3) is concentrated to 40% by three-effect downstream evaporation;

[0041] (5) The concentrate in step (4) is spray-dried under pressure to obtain glucose with a yield of 8% and a purity of 70%;

[0042] (6) acidify the precipitate described ...

Embodiment 3

[0046] The method for preparing glucose and gallic acid by hydrothermally hydrolyzing tannin extract in this embodiment comprises the following steps:

[0047] (1) Weigh 1kg gallnut extract, add it to 20L water, stir and react for 1.0h at a temperature of 140°C and a pressure of 0.5Mpa, and cool the reaction solution to room temperature;

[0048] (2) centrifuging the reaction solution described in step (1) for 5 min at a rotating speed of 5000 rpm / min;

[0049] (3) neutralize the centrifuged liquid described in step (2) with clarified lime water to generate a precipitate, and centrifuge for 5 min at a rotating speed of 5000rpm / min to obtain a solution and a precipitate;

[0050] (4) The centrifugal liquid described in step (3) is concentrated to 32% by three-effect downstream evaporation;

[0051] (5) The concentrated solution in step (4) is spray-dried by air flow to obtain glucose, with a yield of 12% and a purity of 80%;

[0052] (6) acidify the precipitate described in s...

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Abstract

The invention discloses a method for preparing glucose and gallic acid by hydrolyzing a tannin extract through a hydro-thermal method. The method comprises the following steps: (1) hydrolyzing the tannin extract for 0.5-2.0h in a high-temperature autoclave under the condition that the pressure is 0.1-2.8MPa and the temperature is 120-240 DEG C, and performing filtration or centrifugation to obtain a hydrolysate solution; (2) neutralizing the hydrolysate by adopting clear limewater to generate a deposit, and performing filtration or centrifugation to obtain a solution and a deposit; (3) performing concentration and spray drying on the solution to obtain the glucose; and (4) acidifying the deposit by adopting a dilute sulfuric acid solution, then adjusting the pH value of the acidified solution to be 4.0-6.0 by using CaCO3 or clear limewater, performing filtration or centrifugation to obtain a solution, and performing concentration and spray drying to obtain the gallic acid. The method disclosed by the invention is implemented by taking water as a solvent under a high-temperature and high-pressure condition, and is environmentally friendly and efficient, the obtained glucose and gallic acid have relatively high economic values, and the added value of the tannin extract can be effectively improved.

Description

technical field [0001] The invention relates to a method for preparing chemicals by hydrothermally hydrolyzing tannin extract, in particular to a method for preparing glucose and gallic acid by hydrothermally hydrolyzing tannin extract, which belongs to the field of chemical engineering. Background technique [0002] Tannin extract is an important tanning agent, mainly used for tanning leather in the leather industry. In addition, it is also used as mineral processing inhibitor, boiler water treatment agent, drilling mud thinner, metal surface corrosion inhibitor and adhesive. It is a chemical product obtained by processing tannin-rich plant raw materials through hot water extraction, concentration and drying. The main component of extract is tannin, which can be divided into hydrolyzed tannin and condensed tannin according to its structure, wherein hydrolyzed tannin refers to gallic acid or gallic acid derived phenolic carboxylic acid and polyol ( For example, esters form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H3/02C07H1/00C07C65/03C07C51/09
CPCC07C51/09C07H1/00C07H3/02C07C65/03
Inventor 彭湃高岳芳佘雕李秀红
Owner NORTHWEST A & F UNIV
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