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Method for preparing chromium-containing hydrotalcite nano tanning agent by using chromium tanning waste liquid

A technology of hydrotalcite and waste liquor is applied in the field of leather tanning agents, which can solve the problem of environmental pollution by chrome tanning waste liquor, and achieve the effects of reducing chrome pollution, improving biodegradability and increasing tear strength.

Active Publication Date: 2020-12-18
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for preparing chromium-containing hydrotalcite nano-tanning agent by using chrome tanning waste liquid, so as to solve the environmental pollution problem of chrome tanning waste liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: Weigh 0.02 mol of anhydrous sodium carbonate into a beaker, add 100 mL of distilled water, stir and dissolve to obtain a sodium carbonate solution.

[0028] Step 2: Measure 100mL of chrome tanning waste liquid (Cr 2 o 3 1500mg / L), add 1.17g of zinc nitrate hexahydrate powder, stir and dissolve, and make a mixed salt solution with a divalent metal ion and trivalent metal ion molar ratio of 2:1.

[0029] Step 3: At 30°C, slowly drop the above mixed salt solution into a beaker filled with sodium carbonate solution, and keep stirring during the process.

[0030] Step 4: After the dropwise addition, adjust the pH of the solution to 9.0 with 1 mol / L NaOH solution, heat in a water bath to 80° C., stir for 1 h, stop stirring, and heat to reflux for 8 h.

[0031] Step 5: Then wash with deionized water until the pH of the supernatant is neutral, filter it with suction, dry it in a constant temperature drying oven at 60°C for 24 hours, and grind it for use.

Embodiment 2

[0033] Step 1: Weigh 0.02 mol of anhydrous sodium carbonate into a beaker, add 100 mL of distilled water, stir and dissolve to obtain a sodium carbonate solution.

[0034] Step 2: Measure 100mL of chrome tanning waste liquid (Cr 2 o 3 3500mg / L), add 2.23g copper nitrate trihydrate powder, stir and dissolve, and make a mixed salt solution with divalent metal ion and trivalent metal ion molar ratio of 2:1.

[0035] Step 3: At 30°C, slowly drop the above mixed salt solution into a beaker filled with sodium carbonate solution, and keep stirring during the process.

[0036] Step 4: After the dropwise addition, adjust the pH of the solution to 10.0 with 1 mol / L NaOH solution, heat to 85° C. in a water bath, stir for 1 h, stop stirring, and heat to reflux for 8 h.

[0037] Step 5: Then wash with deionized water until the pH of the supernatant is neutral, filter it with suction, dry it in a constant temperature drying oven at 60°C for 24 hours, and grind it for use.

Embodiment 3

[0039] Step 1: Weigh 0.02 mol of anhydrous sodium carbonate into a beaker, add 100 mL of distilled water, stir and dissolve to obtain a sodium carbonate solution.

[0040] Step 2: Measure 100mL of chrome tanning waste liquid (Cr 2 o 3 2500mg / L), add 1.69g of magnesium nitrate hexahydrate powder, stir to dissolve, and make a mixed salt solution with a divalent metal ion and trivalent metal ion molar ratio of 2:1.

[0041] Step 3: At 30°C, slowly drop the above mixed salt solution into a beaker filled with sodium carbonate solution, and keep stirring during the process.

[0042] Step 4: After the dropwise addition, adjust the pH of the solution to 9.0 with 1 mol / L NaOH solution, heat to 90° C. in a water bath, stir for 1 h, stop stirring, and heat to reflux for 8 h.

[0043] Step 5: Then wash with deionized water until the pH of the supernatant is neutral, filter it with suction, dry it in a constant temperature drying oven at 60°C for 24 hours, and grind it for use.

[0044]...

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Abstract

The invention discloses a method for preparing a chromium-containing hydrotalcite nano tanning agent from chrome tanning waste liquid, and aims to solve the problem that the chrome tanning waste liquid pollutes the environment. According to the technical scheme, the method for preparing the chromium-containing hydrotalcite nano tanning agent by utilizing the chrome tanning waste liquid comprises the following steps: utilizing the chrome tanning waste liquid, adopting a coprecipitation method, and controlling the molar ratio of divalent metal ions to chromium ions to prepare the chromium-containing hydrotalcite nano tanning agent. The chromium-containing hydrotalcite nano tanning agent prepared by the method has excellent tanning performance, the shrinkage temperature of tanned crust leather is greater than or equal to 85 DEG C, the tensile strength and the tearing strength are both improved, and the biodegradability of tanning waste liquid using chromium-containing hydrotalcite is improved.

Description

technical field [0001] The invention belongs to the field of leather tanning agents, and in particular relates to a method for preparing chromium-containing hydrotalcite nano-tanning agents by utilizing chrome tanning waste liquor. Background technique [0002] Chrome tanning agents are widely used in the leather industry because of their excellent tanning properties, but the chrome tanning waste is harmful to the environment, so the effective use of chrome tanning waste is one of the research hotspots in the tanning industry. The composition of chrome tanning waste liquid is complex, containing a large amount of heavy metal Cr 3 + , and contains a variety of inorganic ions and organic acids, such as SO 4 2- , Cl - 、Na + 、K + , formic acid, acetic acid, etc., as well as protein decomposed from skin collagen, animal fat, etc., are difficult to process and costly. [0003] Hydrotalcite is a kind of layered double hydroxyl metal hydroxide (LDH) whose main layer is positi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/06
CPCC14C3/06
Inventor 周永香马建中郑侦佐李文博
Owner SHAANXI UNIV OF SCI & TECH
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