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Process for extracting mannitol from kelp soak solution by using membrane method

The technology of soaking liquid and mannitol is applied in the technical field of extracting mannitol from the soaking liquid of kelp by a membrane method, which can solve the problems of difficult cleaning, affecting applications, and high operating costs, and achieves simple process, energy saving, and yield. high effect

Inactive Publication Date: 2005-07-06
QINGDAO BRIGHT MOON SEAWEED GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method steps are complicated, and there are many processes and some process indicators that cannot be industrialized in practice. For example, in the process of ultrafiltration or microfiltration impurity removal, the filter membrane is easily blocked and difficult to clean; It is difficult to meet the process requirements, the service life of the reverse osmosis membrane is relatively short, and the operating cost is high, which affects the application of this process in industrial production

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  • Process for extracting mannitol from kelp soak solution by using membrane method

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specific Embodiment approach 1

[0019] Filter the mannitol-containing kelp soaking solution through a mechanical filter to remove part of the impurities, adjust the pH value of the filtrate (PH=5), and introduce the desalinated water tank of the electrodialyser through the alkali refining and iodine extraction process. Seven-stage ion-exchange membrane electrodialyzer desalination is carried out. Each stage of desalination is composed of 3 electrodialyzers. The conductivity of the influent water is 30000μs / cm, and the conductivity of the effluent water is 1750μs / cm. After the kelp soaking water from electrodialysis is adjusted to pH value (PH=7), it is pumped into a constant pressure filter equipped with diatomaceous earth for impurity removal, and the effluent pollution index SDI=4. The impurity-removed kelp soaking liquid is pumped into a reverse osmosis device consisting of 20 pieces of 8″ roll-type reverse osmosis composite membranes. The inlet pressure is about 1.9Mpa, the outlet pressure is about 1.8Mpa...

specific Embodiment approach 2

[0020] Filter the mannitol-containing kelp soaking liquid through a precision filter after alkali refining, iodine extraction and other processes to remove some impurities, adjust the pH value of the filtrate (PH=4.5), and introduce it into the desalinated water tank of the electrodialyzer , for 8-stage electrodialyzer desalination, each stage of desalination consists of 3 electrodialyzers, the conductivity of the influent water is 32000μs / cm, and the conductivity of the effluent water is 2000μs / cm. After the kelp soaking water from electrodialysis is adjusted to pH (PH=6.8), it is pumped into a constant pressure filter equipped with diatomaceous earth for impurity removal, and the effluent pollution index SDI=3. The impurity-removed kelp soaking liquid is pumped into a reverse osmosis device consisting of 20 pieces of 8″ roll-type reverse osmosis composite membranes. The inlet pressure is about 1.8Mpa, the outlet pressure is about 1.65Mpa, and the incoming kelp soaking liquid ...

specific Embodiment approach 3

[0021] Filter the mannitol-containing kelp soaking solution (ph=4-6) after alkali refining, iodine extraction and other processes to remove perlite and other impurities, and then introduce it into the desalinated water tank of the electrodialyzer for 8-stage electrodialysis Each stage of desalination is composed of 3 electrodialyzers, the conductivity of the influent water is 40000μs / cm, and the conductivity of the effluent water is 2450μs / cm. After the kelp soaking water from electrodialysis is adjusted to pH (PH=6.5), it is pumped into a constant-pressure filter equipped with diatomaceous earth for impurity removal, and the effluent pollution index SDI=3. Pump the kelp soaking liquid into the reverse osmosis device composed of 20 pieces of 8″ roll-type reverse osmosis composite membranes. The inlet pressure is about 1.8Mpa, the outlet pressure is about 1.6Mpa, and the treatment capacity is 20m per hour. 3 The influent kelp soaking liquid contains 1.3% mannitol, the reverse o...

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Abstract

The present invention provides a process for extracting mannitol from kelp soak solution by using membrane method, comprising the following steps: (1)filtering and trash extraction of mannitol containing kelp soak solution after alkali refining and iodine extracting process; (2)salt elimination of ion exchange membrane by electrodialysis; (3)constant pressure filtration by filter aid; (4) reverse osmosis membrane concentration; (5)decolorization, concentration by evaporation and product collection. Wherein, the filtering trash extraction and adoption equipment in step (1) is a mechanical filter or a secondary filter, the filter aid adopted in step (3) is diatomite. The inventive method has simple procedure, high yield and product purity, and saves energy.

Description

technical field [0001] The invention relates to an extraction process, in particular to a process for extracting mannitol from kelp soaking liquid, more specifically, to a process for extracting mannitol from kelp soaking liquid by membrane method Background technique [0002] Kelp is a rich seaweed resource, and most of them are cultivated artificially. The main products in the processing and utilization of kelp are alginate, iodine, and mannitol. The traditional process of extracting mannitol from kelp mainly uses steam evaporation and concentration, which consumes energy High, low extraction rate. In order to solve the problem of high energy consumption, Chinese patent 94109352 provides a method for extracting mannitol from kelp water by using a combined membrane separation process. The method includes soaking, stock solution treatment, iodine extraction, desalination, decolorization, impurity removal, and concentration and collection of product process steps, the method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/76C07C31/26
Inventor 张国防刘洪武冯启忠裴振清赵桂娟卢英俊
Owner QINGDAO BRIGHT MOON SEAWEED GROUP
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