ISO 5351:2010 PDF

Name: ISO 5351:2010 — Pulps — Determination of limiting viscosity number in cupri-ethylenediamine (CED) solution
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Pulps — Determination of limiting viscosity number in cupri-ethylenediamine (CED) solution

Название (английский):

ISO 5351:2010

Pulps — Determination of limiting viscosity number in cupri-ethylenediamine (CED) solution

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 24
Дата публикации:: 2 февраля 2010 г.
Издание:: ISO IS 5351 edition 2 version 1
ICS:: 85.040

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Описание (английский):

ISO 5351:2010 specifies a method which yields a number that is an estimate of the limiting viscosity number of pulp in a dilute cupri-ethylenediamine (CED) solution. ISO 5351:2010 is primarily applicable to CED-soluble samples of bleached chemical pulps but can also be applied to any kind of pulp that dissolves completely in CED solution.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 5351:2010 - Pulps: Determination of limiting viscosity number in cupri-ethylenediamine (CED) solution specifies a standardized laboratory method to estimate the limiting viscosity number [η] of pulp dissolved in a dilute cupri-ethylenediamine (CED) solvent. The method is primarily applicable to CED‑soluble bleached chemical pulps but can be used for any pulp that dissolves completely in CED. Results are used to infer average cellulose molecular mass and the degree of polymerization (DP), giving an indication of cellulose degradation from pulping or bleaching.

Key technical topics and requirements

Principle: Measure efflux times of solvent and pulp solution through capillary‑tube viscometers at 25 °C and calculate the limiting viscosity number using Martin’s formula.

Reagent: CED solution, c = (1.00 ± 0.02) mol·L⁻¹ (saturated with Cu(OH)2). Handle with care (ethylenediamine allergenicity; environmental disposal).

Apparatus:

Two capillary viscometers (water‑jacketed): a calibration viscometer (capillary ≈ 0.58 ± 0.02 mm) and a test viscometer (capillary ≈ 0.80 ± 0.05 mm).
Constant‑temperature bath maintained at (25 ± 0.1) °C.
Dissolving bottles, copper wire, balance (±0.1 mg), timing device (0.1 s).

Controlled shear rate: The procedure targets a shear rate G = (200 ± 30) s⁻¹ to minimize non‑Newtonian effects; product [η] × ρ is chosen to be 3.0 ± 0.4 (viscosity ratio η/η0 ≈ 6–10).

Calibration & procedure: Calibrate viscometers with water, glycerol solution and 0.5 mol·L⁻¹ CED; prepare test solutions with precise mass concentration; measure efflux times and compute viscosity ratio, viscosity number and limiting viscosity number.

Accuracy and scope limitations: Results are primarily valid for samples with low non‑cellulosic content. Viscosity results for pulps with >0.5% lignin are not acceptable for technical specifications; interpret data cautiously if non‑cellulosic substances are present.

Practical applications and users

Quality control and routine testing in pulp and paper laboratories

Monitoring cellulose degradation during pulping and bleaching

Research on degree of polymerization (DP) and molecular weight effects

Process engineers tracking pulp quality and chemical effects

Industrial producers of bleached chemical pulp

Related standards and annexes

Normative references: ISO 638 (dry matter by oven) and ISO 7213 (sampling for testing)

ISO 5351 includes annexes for CED preparation and analysis (Annex A), tables for viscosity calculations (Annex B) and DP estimation (Annex C).

Keywords: ISO 5351:2010, limiting viscosity number, cupri‑ethylenediamine, CED, pulp viscosity, viscometer, degree of polymerization, pulp testing, paper laboratory.

ISO 5351:2010 PDF

Abstract

Похожие стандарты

Overview

Key technical topics and requirements

Practical applications and users

Related standards and annexes

Технические детали

SIST EN ISO 638-1:2022

Paper, board, pulps and cellulosic nanomaterials - Determination of dry matter content by oven-drying method…

SIST EN ISO 7213:2022

Pulps - Sampling for testing (ISO 7213:2021)

SIST ISO 5351:2011

Pulps -- Determination of limiting viscosity number in cupri-ethylenediamine (CED) solution