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Section 7.9

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1 Viikari, L., Ranua, M., Kantelinen, A.,

Sundquist, J., Linko, M. 3rd International

Conference on Biotechnology in

the Pulp and Paper Industry, STFI,

Stockholm, 1986.

2 2,2′-azinobis(3-ethylbenzothiazoline-6-

sulfonic acid).

3 Call, H.P., PCT World Patent Application

No. WO 94/29510, 1994.

4 Call, H.P., PCT World Patent Application

No. WO 97/36041, 1997.

5 1-Hydroxybenzotriazole.

6 Galli, C., Gentili, P., J. Phys. Org. Chem.,

2004; 17: 973.

7 Call, H.P., Mucke, I., J. Biotechnol.,

1997; 53: 163.

8 Rochefort, D., Leech, D.,

Bourbonnais, R., Green Chem., 2004;

6: 14

9 Rochefort, D., Bourbonnais, R., Leech,

D., Renaud, S., Paice, M., J. Electrochem.

Soc., 2002; 149: D15.

10 ACS Symposium Series 785, Oxidative

Delignification Chemistry,

Argyropoulos, D.S. Ed., ACS, Washington,

2001.

11 Weinstock, I.A., Hill, C.L., US Patent

5,302,248, 1994.

12 Evtuguin, D.V., Pascoal Neto, C., Portuguese

Patent 101 857, 1996.

13 For more information on polyoxometalates

see: Polyoxometalates, Chem. Rev.,

1998; 98: 1.

14 Atalla, R.H., Weinstock, I.A., Bond, J.S.,

Reiner, R.S., Sonnen, D.M.,

Houtman, C.J., Heintz, R.A., Hill, C.G.,

Hill, C.L., Wemple, M.W., Geletii, Yu.V.,

Barbuzzi, E.M.G., Polyoxometalatebased

closed systems for oxidative

delignification of wood pulp fibers. In

ACS Symposium Series 785, Oxidative

Delignification Chemistry,

Argyropoulos, D.S. Ed., ACS, Washington,

2001: 313.

15 Weinstock, I.A., Barbuzzi, E.M.G.,

Wemple, M.W., Cowan, J.J., Reiner, R.S.,

Sonnen, D.M., Heintz, R.A., Bond, J.S.,

Hill, C.L., Nature, 2001; 414: 191.

16 Evtuguin, D.S., Pascoal Neto, C., Catalytic

oxidative delignification with Keggin-

type molybdovanadophosphate het 932

7Pulp Bleaching

eropolyanions. In ACS Symposium Series

785, Oxidative Delignification

Chemistry, Argyropolous, D.S. Ed.,

ACS, Washington, 2001: 313.

Section 7.10

1 Suss, H.U., N. Nimmerfroh, Hydrogen

peroxide in chemical pulp bleaching.

ABTCP Meeting. Vitoria, Brazil, 1996.

2 Suss, H.U., Personal communication,

2004.

3 Annergren, G.E., M.G. Boman, P.E.

Sandstrom, Towards the closed cycle

bleach plant. 5th International Conference

on Newly Available Techniques.

Stockholm, Sweden, 1996.

4 Zolio, A., M.R. Silva, M.A.L. Peixoto,

Calcium oxalate scaling in bleach

plants: VCP experience. 33rd Pulp and

Paper Annual Congress. Sao Paulo, Brazil,

2000.

5 Reid, D.W., M.L. Hinck, Factors contributing

to calcium oxalate scale at the

Simpson Tacoma kraft mill. Tappi J.,

2003; 2(2): 8–13.

Pulp Purification

Herbert Sixta

8.1

Introduction

The production of dissolving pulp involves the removal of short-chain carbohydrates,

Denoted as hemicelluloses, which negatively influence either the processing

Behavior of the pulp or the quality of the final product. (The technical definition

Of hemicelluloses comprises both alkali-soluble heteropolysaccharides and

Degraded cellulose soluble in the steeping lye.) Purification processes for dissolving

Pulps include both the removal of noncellulosic material (e.g., extractives, lignin,


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Читайте в этой же книге: Symposium on Delignification with Oxygen | Temperatures. This explains why the alkali consumption does not correspond | The principal means of producing highly purified dissolving pulp. When applying | Concentrations, using X-ray diffraction. Ranby studied the appearance of cellulose | Appears to be alkali-resistant), the NaOH concentration must be increased from | This explains the different pattern of hemicelluloses removal as compared | During alkalization of a beech sulfite dissolving | Content is almost negligible. Therefore, the main objective of the alkali | Lattice planes is widened from the original 0.61 nm to more than 1.2 nm due | Washing. The pulp entering the CCE stage must be thoroughly washed and |
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Journal of Industrial and Engineering| Hemicelluloses), and the change of the molecular distribution to a narrow,

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