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CNC hydrolysis acid circulation process based on diffusion dialysis and electrodialysis series combination

A technology of diffusion dialysis and series combination, applied in the field of green and low-cost preparation, can solve the problems of low separation efficiency and high maintenance cost, and achieve the effects of environmental friendliness, low cost and low energy consumption

Pending Publication Date: 2022-05-27
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the separation efficiency of a single membrane separation technology at room temperature is not high, and the separation efficiency depends on the properties and quality of the separation membrane. The maintenance cost of the membrane is relatively high, and there are still many technical and economic cost problems in practical industrial applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]The cellulose raw material was crushed to less than 7 mm in advance with a fiber cutter, and dried; 200 L of sulfuric acid with a mass fraction of 65% was added to the 500 L reaction kettle, and preheated to 55 ° C; 25 kg of pulverized and dried cotton was put into the reaction kettle, The reaction was stirred for 180 min to obtain the cellulose nanocrystal acid hydrolysis stock solution, and the cellulose nanocrystal hydrolyzate and the waste acid were collected after separation;

[0042] The separated waste acid was diluted to a sulfuric acid concentration of 10 wt%.

[0043] The waste acid was injected into the diffusion dialysis chamber of the diffusion dialysis device using a peristaltic pump, and the flow rate was 0.1L / (m 2 h); use a peristaltic pump to pass water into the diffusion chamber of the diffusion dialysis device, and the ratio of water flow to waste acid flow is 1:1.

[0044] The recovered acid was collected from the diffusion chamber, and the acid conc...

Embodiment 2

[0050] The cellulose raw material was crushed to less than 7mm with a fiber cutter in advance, and dried; 200L of sulfuric acid with a mass fraction of 62% was added to the 500L reaction kettle, and preheated to 45°C; 25kg of pulverized and dried cotton was put into the reaction kettle, The reaction was stirred for 120 min to obtain the cellulose nanocrystal acid hydrolysis stock solution, and after separation, the cellulose nanocrystal hydrolyzate and the waste acid were collected respectively;

[0051] The separated waste acid was diluted to a sulfuric acid concentration of 16 wt%.

[0052] The waste acid was injected into the diffusion dialysis chamber of the diffusion dialysis device using a peristaltic pump, and the flow rate was 0.235L / (m 2 h); use a peristaltic pump to pass water into the diffusion chamber of the diffusion dialysis device, and the ratio of water flow to waste acid flow is 1:1.

[0053] The recovered acid was collected from the diffusion chamber, and th...

Embodiment 3

[0059] The cellulose raw material was crushed to less than 7mm with a fiber cutter in advance, and dried; 200L of sulfuric acid with a mass fraction of 62% was added to the 500L reaction kettle, and preheated to 45°C; 25kg of pulverized and dried cotton was put into the reaction kettle, The reaction was stirred for 120 min to obtain the cellulose nanocrystal acid hydrolysis stock solution, and after separation, the cellulose nanocrystal hydrolyzate and the waste acid were collected respectively;

[0060] The separated waste acid was diluted to a sulfuric acid concentration of 4 wt%.

[0061] The waste acid was injected into the diffusion dialysis chamber of the diffusion dialysis device using a peristaltic pump at a flow rate of 0.235 L / (m 2 h); use a peristaltic pump to pass water into the diffusion chamber of the diffusion dialysis device, and the ratio of water flow to waste acid flow is 1:1.

[0062] The acid concentration was collected from the diffusion chamber, and the...

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Abstract

The invention provides a CNC (Computer Numerical Control) hydrolysis acid circulation process based on series combination of diffusion dialysis and electrodialysis, which comprises the following specific steps: preparing a cellulose nanocrystal acid hydrolysis stock solution, separating, and respectively collecting cellulose nanocrystal hydrolysate and waste acid; diluting the separated waste acid; injecting the diluted waste acid into a diffusion dialysis device through a pump, and collecting diffused acid liquor and residual liquor; pumping the residual liquid into an electrodialysis device, circularly operating, and collecting concentrated acid liquor; the diffusion acid liquor and the concentrated acid liquor are respectively mixed with corresponding inorganic concentrated acid to prepare the medium-concentration inorganic acid, so that the recycling of the acid in the CNC preparation process is realized. The invention aims to separate organic matters such as sugar dissolved in inorganic acid and realize cyclic utilization of waste acid. By designing the combination of diffusion dialysis and electrodialysis, more than 99% of sulfuric acid can be recovered, most sugar can be obtained, and cyclic utilization of sulfuric acid is realized. The method is simple to operate and easy to industrially amplify; the cost and the energy consumption are low; the method is environment-friendly and few in pollutants.

Description

technical field [0001] The invention belongs to the technical field of waste acid recovery, and in particular relates to the separation of acid in the hydrolyzate in the process of preparing cellulose nanocrystals, thereby reducing the preparation cost and realizing the green and low-cost preparation of large-scale cellulose nanocrystals. Background technique [0002] Cellulose nanocrystal (CNC) is a rigid rod-like nanomaterial with high specific surface area, light weight, low density, excellent mechanical properties, renewable, degradable, good biocompatibility and high crystallinity. It has good hydrophilicity. and surface chemical modification properties. The diameter is 3-50 nanometers, and the length is tens to hundreds of nanometers. Due to its good physicochemical properties and ecological properties, nanocellulose has been widely used in medicine, electronics, construction, food, coatings and other fields in recent years. The nanocellulose market is expected to gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/58B01D61/48B01D61/44B01D61/42B01D61/28B01D61/24C01B17/90C08B15/02D21C5/00
CPCB01D61/58B01D61/243B01D61/422B01D61/44B01D61/48B01D61/28C01B17/90C01B17/901C01B17/902C01B17/904C08B15/02D21C5/00
Inventor 苏荣欣黄仁亮张磊丁国杰樊洁
Owner TIANJIN UNIV
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