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Method for effectively reducing chlorine gas produced while bleaching gracilaria verrusosa with sodium hypochlorite

A technology of sodium hypochlorite and production amount, applied in the field of chemistry, can solve problems such as polluting the environment and affecting the health of workers, and achieve the effects of improving product quality, good social and economic benefits, and reasonable design

Inactive Publication Date: 2004-08-11
GUANGDONG OCEAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most enterprises in Guangdong, Guangxi, Hainan and other places mainly use sodium hypochlorite to bleach Gracilaria when producing agar from Gracilaria. The problem of different concentrations of chlorine gas is produced. Some companies use absorption methods to deal with it, while many companies do not do any treatment, allowing chlorine gas to diffuse naturally in the workshop and the surrounding environment, which seriously affects the health of workers and pollutes the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Experiments with Gracilaria spp.:

[0027] (1) Alkali treatment

[0028] Gracilaria spp. was treated with a 28% NaOH concentration solution at a temperature of 65°C for 16 hours. After alkali treatment, the gracilaria was washed with water and soaked to neutrality;

[0029] (2) Bleaching

[0030] a. Acidification: Prepare a solution containing 0.24% HCI concentration to acidify Gracilaria spp. at room temperature for 5 minutes;

[0031] b. Cleaning: After acidification, drain the acidification solution in time, rinse with water for 1-2 times, and then add appropriate amount of water for the next step;

[0032] c. Sodium hypochlorite bleaching: the acidified and cleaned Gracilaria spp. is placed in a sodium hypochlorite solution of 0.07% available chlorine for bleaching. The bleaching time at normal temperature is 10 minutes. Drain the sodium hypochlorite bleach solution and add water to the original volume;

[0033] d. Acidification and whitening of oxalic acid solut...

Embodiment 2

[0037] Experiment with Gracilaria spp.:

[0038] (1) Alkali treatment

[0039] Gracilaria is treated with 20% NaOH concentration solution, the treatment temperature is 65°C, 16 hours, after alkali treatment, rinse with water, soak Gracilaria until neutral;

[0040] (2) Bleaching

[0041] a. Acidification: Prepare a solution containing 0.35% HCI concentration to acidify Gracilaria spp. at room temperature for 5 minutes;

[0042] b. Cleaning: After acidification, drain the acidification solution in time, rinse with water for 1-2 times, and then add appropriate amount of water for the next step;

[0043] c. Sodium hypochlorite bleaching: the acidified and cleaned Gracilaria is placed in a sodium hypochlorite solution of 0.10% available chlorine for bleaching. The bleaching time at normal temperature is 10 minutes. Drain the sodium hypochlorite bleach solution and add water to the original volume;

[0044] d. Acidify and whiten the oxalic acid solution again: add 5% oxalic acid...

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Abstract

The Gracilaria verrucosa bleaching process includes the steps of alkali treatment, preacidification, cleaning, bleaching with sodium hypochlorite, reacidification with oxalic acid and post-treatment has relatively low chlorine gas producing amount. Controlling the chlorine gas producing amount within safety standard can ensure the health of the work staff and no pollution to environment. The present invention can eliminate the step of eliminating chlorine pollution and thus reduce production cost.

Description

technical field [0001] The invention discloses a method for effectively reducing the amount of chlorine gas produced when gracilaria is bleached by a sodium hypochlorite method, belonging to the chemical field, in particular to a method for reducing the amount of chlorine gas generated when the gracilaria is bleached by a sodium hypochlorite method. Background technique [0002] At present, most enterprises in Guangdong, Guangxi, Hainan and other places mainly use sodium hypochlorite to bleach Gracilaria when producing agar from Gracilaria. The problem of different concentrations of chlorine gas is produced. Some enterprises adopt the method of absorption to deal with it, while many enterprises do not do any treatment, allowing chlorine gas to diffuse naturally in the workshop and the surrounding environment, which seriously affects the health of workers and pollutes the environment. Contents of the invention [0003] The object of this invention is to provide a kind of me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/12
Inventor 蔡鹰黄家康吴湛霞
Owner GUANGDONG OCEAN UNIVERSITY
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