Method for producing inositol and co-producing monopotassium phosphate by adopting corn steep liquor as well as inositol and monopotassium phosphate produced by the method

Abstract

The invention discloses a method for producing inositol and co-producing potassium dihydrogen phosphate by using corn steep liquor, which comprises the following steps: (1) selectively adsorbing phytic acid in the corn steep liquor by using anion exchange resin, and desorbing the anion exchange resin by using a potassium chloride solution to obtain a desorption solution containing potassium phytate; (2) hydrolyzing the desorption solution to obtain hydrolysate; and (3) separating the hydrolysate through electrodialysis to obtain a salt phase and an inositol phase, purifying inositol in the inositol phase to obtain an inositol finished product, and crystallizing monopotassium phosphate in the salt phase to obtain a monopotassium phosphate finished product. The method for producing the inositol and co-producing the monopotassium phosphate by adopting the corn steep liquor is unique and novel, high-purity inositol can be produced, the added value of the byproduct monopotassium phosphate is high, and the method is suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of inositol, in particular to the technical field of inositol production, specifically a method for producing inositol and potassium dihydrogen phosphate by using corn steep liquor and the produced inositol and potassium dihydrogen phosphate. Background technique [0002] During the processing and utilization of corn, a large amount of process wastewater will be generated, also called corn soaking water or corn steep liquor. Most of the corn soaking water comes from the wet starch production line. The corn soaking water contains 1.9% to 2.4% by weight of phytic acid. Phytic acid reacts with calcium hydroxide to form solid phytin (calcium phytate), which is used to produce inositol. Raw materials are necessary and the market demand is stable. [0003] The currently widely used phytin extraction process is to directly add milk of lime to neutralize phytic acid in corn soaking water to generate a mixture of ca...

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Problems solved by technology

[0010] Although the process is simple, it has the following defects: one, the odor is very large in the production process; two, the filtrate contains a large amount of Ca 2+ , the fouling of the evaporator is serious during the concentration process; third, the added value of the generated calcium phosphate is low, so it can only be bought to the fertilizer factory to produce low-end compound fertilizer; fourth, there are many impurities and it is difficult to purify, because the impurities such as magnesium and sulfur in the waste liquid are Precipitation into phytin together increases the difficulty of subsequent purification and purification is difficult, so the purity of inositol produced by most old processes is not high, about 90% to 95%

[0011] Although this production process has been used for many years and has passed various improvements, there are still disadvantages such as cumbersome process, low product quality, high labor intensity, serious pollution, and strong odor.

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