发明名称 |
FORFARANDE FOR FRAMSTELLNING AV BILLIG CELLULOSAMASSA |
摘要 |
A process is provided for inexpensively producing high yield mechanical cellulose pulp having good paper properties, which comprises preheating particulate lignocellulosic material; defibrating the preheated material under a superatmospheric steam pressure within the range from about 2 to about 4.5 bar above atmospheric pressure in a disc refiner under conditions such that steam is generated during the defibration; continuing the defibration until a cellulose pulp is obtained having a freeness within the range from about 300 to about 700 ml CSF; flash drying the defibrated cellulose pulp while maintaining a superatmospheric steam pressure within the said range during the drying; withdrawing steam generated during the defibration and passing it in indirect heat exchange with steam utilized in the flash drying, so as to utilize in the drying at least 30% of the heat content thereof; and then removing and baling the flash-dried cellulose pulp. Water vapor produced in the flash dryer is condensed and recycled to the disc refiner. |
申请公布号 |
SE8202868(L) |
申请公布日期 |
1983.11.08 |
申请号 |
SE19820002868 |
申请日期 |
1982.05.07 |
申请人 |
MODO CHEMETICS AB |
发明人 |
AHREL B A;HENRIKSSON S-E D;SVENSSON C G S;FRANZEN T A H |
分类号 |
D21C9/18;(IPC1-7):D21B1/12 |
主分类号 |
D21C9/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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