Compound enzyme and application thereof

Abstract

The invention discloses a compound enzyme and application thereof, and relates to the technical field of pulping. The compound enzyme is prepared from the following components in parts by weight: 1-10 parts of pectinase, 1-10 parts of lipase, 3-15 parts of hemicellulase and 65-95 parts of cellulase. The invention further provides application of the compound enzyme in a pulping process, so that the pulping energy consumption can be reduced, and the equipment investment can be reduced.

Description

technical field [0001] The invention relates to the technical field of pulping, in particular to a composite enzyme and its application. Background technique [0002] Bleached kraft chemical fluff pulp is generally mostly cellulose, and contains a small amount of hemicellulose and residual lignin and resin. The purpose of beating is to use mechanical treatment to destroy the primary wall of the fiber cell wall and detach the secondary wall, increase the bonding area of ​​fibers, and improve the bonding force. [0003] The current mill beating scheme, because the pulp is difficult to beat, and a single mill beating cannot meet the requirements, the design uses 4 RF-4i mills to form two beating lines, and each beating line is composed of 2 mills in series. The maximum capacity of the refining line is 410bdt / day, the initial freeness before grinding is 500ml, the freeness after grinding is 330-380ml, the refining concentration is 4.5%, and the specific energy consumption of ea...

AI Technical Summary

Problems solved by technology

[0003] The current mill beating scheme, because the pulp is difficult to beat, and a single mill beating cannot meet the requirements, the design uses 4 RF-4i mills to form two beating lines, and each beating line is composed of 2 mills in series. The maximum capacity of the refining line is 410bdt / day, the initial freeness before grinding is 500ml, the freeness after grinding is 330-380ml, the refining concentration is 4.5%, and the specific energy consumption of each refining line is 25kwh / t for the first mill , the second mill 45kwh / t, the total is 70kwh / t

[0004] In this beating technical scheme, there are the following disadvantages: (1) The specific energy consumption of beating is as high as 70kwh / t, and according to the output of 410bdt / day, the electricity cost of each beating line is as high as RMB9000, and the energy consumption is high; (2) The energy consumption of beating is high, The wear speed of the grinding disc is fast, and the service life of the grinding disc is only 2-3 months. Each mill needs 5 sets of grinding discs per year. The annual spare parts cost of each mill is as high as RMB1 million, and the cost of spare parts is high; (3) Each mill is beaten In the line design, two RF-4i mills need to be connected in series. The purchase cost of the mill equipment alone for the two beating lines is RMB 10 million, and the investment in equipment is large.

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