SYSTEM AND METHOD FOR RECOVERING PROTEIN IN PRODUCTION PROCESS OF ULTRAHIGH MALTOSE SYRUP

Abstract

The present invention provides a system for recovering protein in a production process of an ultrahigh maltose syrup, including a saccharification tank, an enzyme preparation tank, a first plate heat exchanger, a second plate heat exchanger, a plate and frame filter, a buffer tank and a rotary drum filter. The present invention further provides a method of recovering protein by using the system. After the sugar liquid in the saccharification tank is stood, the protein floats at the upper part of the saccharification tank and the lower liquid is clear and transparent and thus the sugar liquid can be directly filtered. When the saccharification tank is discharged, the lower liquid is firstly discharged with the remaining liquid being bottoms containing protein. During a production process, enzymatic hydrolysis is performed for the sugar liquid containing protein before filtration to improve the filtration effect of the sugar liquid. Assisted by the plate and frame filter, protein can be recovered. The present invention improves the economic benefits, reduces the production costs, and thus solves the problem of difficulty in recovering protein in a production process of an ultrahigh maltose syrup.

Description

Claims

1. A system for recovering protein in a production process of an ultrahigh maltose syrup, comprising a saccharification tank, an enzyme preparation tank, a first plate heat exchanger, a second plate heat exchanger, a plate and frame filter, a buffer tank and a rotary drum filter, wherein the enzyme preparation tank is communicated with a liquid inlet end of the saccharification tank through a pipe, and the liquid inlet end of the saccharification tank is communicated with a liquefaction liquid to be saccharified and a saccharifying enzyme through a pipe respectively,a liquid outlet end of the saccharification tank is communicated with an inlet end of the first plate heat exchanger through a pipe, an outlet end of the first plate heat exchanger is communicated with the liquid inlet end of the saccharification tank through a pipe,the liquid outlet end of the saccharification tank is further communicated with an inlet end of the second plate heat exchanger through a pipe, an outlet end of the second plate heat exchanger is communicated with an inlet end of the plate and frame filter through a pipe,the plate and frame filter is configured to filter residues containing protein to be recovered, a residue outlet end of the plate and frame filter is communicated with an inlet end of a spiral conveyor through a pipe, the spiral conveyor is configured to transfer the residues for recycling,a liquid outlet end of the plate and frame filter is communicated with a liquid inlet end of the buffer tank through a pipe, a liquid outlet end of the buffer tank is communicated with the rotary drum filter through a pipe, and a liquid outlet end of the rotary drum filter is communicated with a subsequent working procedure.

2. The system of claim 1, further comprising: a circulation pump, a sugar liquid pump and a syrup pump, wherein the circulation pump is disposed on the pipe communicating the first plate heat exchanger with the liquid outlet end of the saccharification tank, the sugar liquid pump is disposed on the pipe communicating the second plate heat exchanger with the liquid outlet end of the saccharification tank, and the syrup pump is disposed on the pipe communicating the rotary drum filter with the liquid outlet end of the buffer tank.

3. A method of recovering protein in a production process of an ultrahigh maltose syrup, using the system for recovering protein in a production process of an ultrahigh maltose syrup according to claim 2, wherein the system comprises at least one saccharification tank; wherein, when one saccharification tank is used, the method of recovering protein in a production process of an ultrahigh maltose syrup comprises the following steps:(a) allowing the liquefaction liquid to be saccharified to enter the at least one saccharification tank while stirring, and adding the saccharifying enzyme to form a mixture containing the saccharifying enzyme;(b) after completion of the step (a), stirring the mixture containing the saccharifying enzyme to form a syrup, and allowing the syrup to stand to allow protein to float at an upper part of the at least one saccharification tank(c) after completion of the step (b), operating the sugar liquid pump to enable the syrup obtained in the step (b) to pass through the second plate heat exchanger to cool down through heat exchange with an evaporation feed and enter the plate and frame filter for filtration, conveying a filtrate into the buffer tank and then into the rotary drum filter for filtration to obtain a rotary drum filtrate, and then performing decolorization, ion exchange and evaporation for the rotary drum filtrate to finally obtain a finished ultrahigh maltose syrup;(d) when the remaining liquid level of the atleast one saccharification tank is 10-15%, stop discharging the syrup obtained in step (b) from the at least one saccharification tank;(e) after completion of the step (d), weighing a lysophospholipase into the enzyme preparation tank, operating a diaphragm pump to convey the lysophospholipase into the at least one saccharification tank to form a mixture containing the lysophospholipase ;(f) after completion of the step (e), stirring the mixture containing the lysophospholipase in the at least one saccharification tank to form a syrup ;(g) after completion of the step (f), operating the circulation pump, to enable the syrup obtained in the step (f) in the 1# saccharification tank to run through the first plate heat exchanger for being heated cyclically; when the temperature of the 1# saccharification tank reaches a preset temperature, stopping cyclic heating;(h) after completion of the step (g), weighing a high-temperature-resistant α-amylase into the enzyme preparation tank, starting operating the diaphragm pump to convey the high-temperature-resistant α-amylase into the at least one saccharification tank to form a mixture containing the α-amylase, ;(i) after completion of the step (h), stirring the mixture containing the α-amylase in the at least one saccharification tank to form a sugar liquid containing protein ;(j) after completion of the step (i), enabling the sugar liquid containing protein to run through the second plate heat exchanger to cool down through heat exchange with the evaporation feed, and enter the plate and frame filter for filtration, retaining protein in the plate and frame filter, and conveying a filtrate into the buffer tank, and then into the rotary drum filter for filtration to obtain a rotary drum filtrate, and performing decolorization, ion exchange and evaporation for the rotary drum filtrate to finally obtain a finished ultrahigh maltose syrup;(k) after completion of the step (j), and after the protein in the plate and frame filter is dried, discharging the protein to the spiral conveyor from the plate and frame filter for recovery.

4. The method of claim 3, wherein, in the step (a), the liquefaction liquid to be saccharified has a temperature of 58 to 61° C., a pH of 5.0 to 5.4 and a DE value of 3.0 to 4.0.

5. The method of claim 3, wherein, in the step (a), the addition amount of the saccharifying enzyme is 0.30 to 0.35 kg/dry basis ton.

6. The method of claim 3, wherein, in the step (b), the stirring lasts for 40 to 45 h and the standing proceeds for at least 5 h.

7. The method of claim 3, wherein, in the step (e), the lysophospholipase is added based on 0.16 to 0.22 kg/dry basis ton.

8. The method of claim 3, wherein, in the step (g) the preset temperature is 95 to 97° C.

9. The method of claim 3, wherein, in the step (h), the high-temperature-resistant α-amylase is added based on 0.36 to 0.44 kg/dry basis ton.

10. The method of claim 3, wherein, in the step (k), the protein in the plate and frame filter is dried by air ejection, water ejection, and air ejection respectively for 10 to 15 min, 2 to 5 min and 15 to 20 min.

11. The method of claim 3, wherein, in the step (f), the stirring lasts for at least 2 h.

12. The method of claim 3, wherein, in the step (i), the stirring lasts for at least 4 h.