Method and device for continuously extracting starch in corn fiber skin by enzymic method

A corn fiber and continuous technology, applied in the field of enzymatic continuous extraction of starch from corn fiber husks, can solve the problems of high energy consumption, impossibility of industrial application, high processing cost, etc., achieve high concentration, good application and promotion prospects, and high extraction efficiency Effect

Active Publication Date: 2012-10-03
SHANDONG LUZHOU FOOD GROUP +1
5 Cites 2 Cited by

AI-Extracted Technical Summary

Problems solved by technology

If it is used alone to extract starch from corn husks, not only the energy consumption of the pre-treatment is high, but the processing...
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Abstract

The invention relates to a method and a device for continuously extracting starch in corn fiber skin by an enzymic method. The device comprises a motor, an extraction barrel, a screw conveyer bar and a storage tank, wherein the screw conveyer bar is arranged in the extraction barrel, and a hydrolysate outlet is communicated with the storage tank. The method comprises the following steps of: (1) preparing an extracting solution; (2) carrying out backward motion contact on the corn fiber skin and the extracting solution to hydrolyze starch in the corn fiber skin; and (3) when the content of the starch in corn fiber skin residues is larger than 1.5 wt%, regulating through reducing the feeding speed of the corn fiber skin, prolonging the hydrolysis time and/or improving the hydrolysate adding speed; and when the DE (Dextrose Equivalent) value of the hydrolysate is smaller than 15%, regulating through reducing the feeding speed of the corn fiber skin, prolonging the hydrolysis time and/or improving the amylase concentration of the extracting solution. The stable and continuous extraction of the starch in the corn fiber skin is realized by the method provided by the invention, the extraction efficiency is high, and the yield is high; and the hydrolysate concentration is high, which is as high as 3-5 times of intermittent extraction concentration.

Application Domain

Enzyme production/based bioreactorsFermentation +1

Technology Topic

Dextrose equivalentEnzyme +6

Image

  • Method and device for continuously extracting starch in corn fiber skin by enzymic method
  • Method and device for continuously extracting starch in corn fiber skin by enzymic method
  • Method and device for continuously extracting starch in corn fiber skin by enzymic method

Examples

  • Experimental program(4)

Example Embodiment

[0038] Example 1
[0039] An enzymatic method for continuously extracting starch from corn fiber husks includes a variable frequency motor 1, an extraction cylinder 7, a screw conveying rod 5, and a storage tank 4. The extraction cylinder 7 is an inclined closed cylinder. The conveying rod 5 is arranged in the extraction cylinder 7, one end of the screw conveying rod 5 is connected to the frequency conversion speed regulating motor 1 arranged outside the lower end of the extraction cylinder through a connecting rod. The length of the screw conveying rod 5 and the diameter of the screw 10 are the same as those of the extraction cylinder 7. The length of the extraction cylinder 7 is compatible with the inner diameter of the cylinder; the upper surface of the lower end of the side wall of the extraction cylinder 7 is provided with a feed inlet 2, and the lower surface of the lower end of the side wall of the extraction cylinder 7 is provided with a hydrolysate outlet 3, which is connected to the storage tank 4. A filter screen is arranged between the hydrolysate outlet 3 and the storage tank 4; the upper surface of the upper part of the side wall of the extraction cylinder 7 is provided with an extraction liquid inlet 6, and the lower surface of the upper end of the side wall of the extraction cylinder 7 is provided with a discharge port 8; The angle between the extraction cylinder 7 and the horizontal plane is 45 degrees;
[0040] The cylinder body of the extraction cylinder 7 includes an extraction section cylinder body 11 and a squeezing section cylinder body 12, the extraction section cylinder body 11 is cylindrical, the extraction section cylinder body 11 has a length of 6 meters and an inner diameter of 0.8 meters; the squeezing section cylinder body 12 is in the shape of a truncated cone. The lower opening of the squeezing section cylinder 12 is airtightly connected with one end of the extraction section cylinder 11. The length of the squeezing section cylinder 12 is 2 meters, and the diameter of the upper opening of the squeezing section cylinder 12 is 0.55 meters. The diameter of the lower opening is 0.8 meters; the extraction liquid inlet 6 is arranged on the upper surface of the upper part of the side wall of the extraction section cylinder 11;
[0041] The length of the screw conveying rod 5 is 8 meters, the distance between the spiral piece 10 of the screw conveying rod 5 and the cylinder body of the extraction cylinder 7 is 2mm, and the distance between adjacent spiral pieces 10 is 25cm; the spiral piece 10 is provided with Holes 9 with a diameter of 1.5 mm, and the total area of ​​the holes is 10% of the area of ​​the spiral.

Example Embodiment

[0042] Example 2
[0043] The method of enzymatically extracting starch from corn fiber bark using the device described in Example 1 is as follows:
[0044] (1) Preparation temperature is 70~72℃, pH is 6, and contains 300U/L medium temperature α-amylase extract;
[0045] (2) According to the feeding speed of 113.6kg/h (dry weight of 100kg/h) of corn fiber husks, add corn fiber husks to the extraction cylinder through the inlet, and the corn fiber husks move from the bottom of the extraction cylinder to the top of the extraction cylinder. Movement, add the extraction liquid prepared in step (1) to the extraction cylinder through the extraction liquid inlet at a dosing rate of 400L/h. The extraction liquid moves from the top of the extraction cylinder to the bottom of the extraction cylinder, passing through the corn fiber bark and the extraction liquid. The reverse movement contact of the corn fiber bark is used to hydrolyze the starch in the corn fiber bark. The hydrolysis time of the starch in the corn fiber bark is 4h. After squeezing dry, the corn fiber bark residue and hydrolyzate are obtained;
[0046] (3) After testing, the starch content in the corn fiber hull residue is 1.4wt%, the starch sugar concentration in the hydrolyzate is 4.7% by weight, and the DE value is 15.8%. The hydrolyzate and corn fiber hull residue are recovered.
[0047] After continuously recovering the hydrolysate and corn fiber husk residue for 5 hours, after testing, the starch content in the corn fiber husk residue was 1.2wt%, the starch sugar concentration in the hydrolyzate was 5.1wt%, and the DE value of the extract was 16.5%;
[0048] After 6 hours of continuous recovery of the hydrolysate and corn fiber hull residue, after testing, the starch content in the corn fiber hull residue was 1.2wt%, the starch sugar concentration in the hydrolyzate was 5.0wt%, and the DE value of the extract was 16.8%;
[0049] After 8 hours of continuous recovery of the hydrolysate and corn fiber hull residue, a total of 908.8kg was fed to obtain 2687kg of hydrolysate. The average concentration of starch sugar in the hydrolysate was 5.0wt%, the DE value was 16.7%, and the extraction yield of starch was 92.8%.
[0050] The above-mentioned hydrolysate can be directly used for starch milk slurrying in starch sugar production.

Example Embodiment

[0051] Example 3
[0052] The method of enzymatically extracting starch from corn fiber bark using the device described in Example 1 is as follows:
[0053] (1) The preparation temperature is 88~90℃, pH is 6, and contains 900U/ml high temperature α-amylase extract;
[0054] (2) According to the feed rate of 227.3kg/h (dry weight of 200kg/h) of corn fiber husks, add corn fiber husks to the extraction cylinder through the inlet, and the corn fiber husks move from the bottom of the extraction cylinder to the top of the extraction cylinder. Movement, add the extraction liquid prepared in step (1) to the extraction cylinder through the extraction liquid inlet at a rate of 1200L/h. The extraction liquid moves from the top of the extraction cylinder to the bottom of the extraction cylinder, passing through the corn fiber bark and the extraction liquid. The reverse motion contact of the corn fiber husk is used to hydrolyze the starch in the corn fiber husk. The hydrolysis time of the starch in the corn fiber husk is 2h. After squeezing and drying, the corn fiber husk residue and hydrolyzate are obtained;
[0055] (3) After testing, the starch content in the corn fiber hull residue is 1.3wt%, the concentration of starch sugar in the hydrolyzate is 3.3wt%, and the DE value is 16.2%. The hydrolyzate and corn fiber hull residue are recovered.
[0056] After continuously recovering the hydrolysate and corn fiber husk residue for 7 hours, it was tested that the starch content in the corn fiber husk residue was 1.0wt%, the starch sugar concentration in the hydrolyzate was 3.4wt%, and the DE value of the extract was 15.7%;
[0057] After 9 hours of continuous recovery of the hydrolysate and corn fiber hull residue, a total of 2045.7 kg was fed to obtain 8900 kg of hydrolysate. The average concentration of starch sugar in the hydrolysate was 3.4wt%, the DE value was 16.7%, and the extraction yield of starch was 92.9%.
[0058] The above-mentioned hydrolyzed liquid can be added to the liquefied liquid after spray liquefaction.

PUM

PropertyMeasurementUnit
Upper mouth diameter0.55m
Lower mouth diameter0.8m

Description & Claims & Application Information

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