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

[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.

[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.

[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.