GB/T 3710-2009Method of determination for crystallizing point of technical phenol and phenic acid (English PDF)

1 Scope

This standard specifies the principles of technical phenol and crystallization point measurement, reagents, instruments, sample taking, test procedures, the results of calculation and precision

Accuracy.

This standard applies to high-temperature coal tar crude phenol, measured by the fractionation of the obtained technical phenol and crystallization point.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent

Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement according to study

Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB/T 1999 coking oil products sampling methods

YB/T 2305 coking products testing Thermometers

Principle 3

Industrial phenol, phenol cooling when the temperature is gradually decreased to a certain temperature began to have crystals, and since the release of the heat of crystallization, the temperature

Recovered slightly, reaching the highest point, and stable for a moment, then continued to decline, the highest point of the temperature measurement is the crystallization point.

4 Reagents

Zeolite. 4A, powdered, granular <=125µm (>=120 mesh mesh). Before using the high-temperature furnace burning 2h at 450 °C ~ 500 °C, the

Stored in the non-desiccant dryers.

5 Instruments

6 samples taken

Samples were taken according to GB/T 1999 regulations.