GB 338-2011[GB/T 338-2011] Methanol for industrial use (English PDF)

5.1 of Edition 2004).

Using re-drafting method, this Standard modifies-adopts the American Society for Testing

Materials standard ASTM D1152.2006 Methanol. Compared with ASTM D1152.2006,

there are adjustments on the structure. Annex A lists out the Contrast List between

chapter and article number in this Standard and ASTM D1152.2006.The technical

differences and their reasons between this Standard and the ASTM D1152.2006 are as

follows.

— Indicators are divided into superior products, first-class products and qualified

products (see Chapter 3.2). Which is determined based on the classification

guideline of the relevant industrial products in China;

— Added the water miscibility item and the ethanol content item (see Chapter 3.2).

This is to strictly control the product quality;

— The color scale, boiling range, acid or alkali and other indicators of the superior

products are better than those specified in ASTM D1152.2006 (see Chapter 3.2);

— In addition to the use of the method specified in the ASTM D1152.2006 for the

sulfuric acid washing test, other test methods all adopt the national standards for

products testing method of China (see Chapter 4).

This Standard was proposed by China Petroleum and Chemical Industry Federation.

This Standard shall be under jurisdiction of Branch of Organic Chemicals of National

Standardization Technical Committee of Chemical (SAC/TC 63/SC 2).

Drafting organization of this Standard. Sinopec Sichuan Vinylon Works Group.

Participating drafting organizations of this Standard. Shanghai Coking & Chemical

Corporation, Shaanxi Yulin Natural Gas Chemical Industry Co., Ltd., Jiangsu SOPO

(Group) Co., Ltd., Methanol Branch of Daqing Oilfield Chemicals Co., Ltd., Zhejiang Jinju

Chemical Co., Ltd. and Guizhou Yihua Chemical Industry Co., Ltd.

Main drafters of this Standard. Yan Hong, Pu Lijun, Li Bin, Zhai Li, Zhou Bing, Lu Jiayun,

Zeng Yan, Zhai Xiaoxia, Wang Shumei, Ge Lixin, Zhang Xueyong, Lan Yuandong, Yang

Hongmei.

The previous editions replaced by this Standard are as follows.

— GB 338-1964, GB 338-1976, GB 338-1985, GB 338-1992, GB 338-2004.

Methanol for Industrial Use

3.1 Character. Colorless clear liquid, without peculiar smell and odor, and without visible

impurities.

3.2 Methanol for industrial use shall meet the technical requirements shown in Table 1.

4.1 Warning

Some processes specified by the test method may lead to dangerous situations, so

the operator shall take appropriate safety and protective measures.

4.2 General provisions

Unless otherwise specified, only confirmed analytically pure reagent and Grade-3 water

met the GB/T 6682 are used in the analysis.

If there is no other requirements noted, the standard titration solution, preparations and

products used in the analysis shall be prepared in accordance with provisions of GB/T 601

and GB/T 603.

4.6 Determination of boiling range

It shall be conducted according to the method specified in GB/T 7534.Distillation flask is

of 100mL; indication range of the thermometer is 50°C - 70°C, with the division value of

0.1°C. For the correction of the full immersion thermometers and mercury manometer, see

Annex C.

4.10 Determination of acid or alkali content

4.10.1 Method summary

The specimen is diluted by water that does not contain carbon dioxide, with the

bromothymol blue as indicator;

4.10.4 Analytical procedures

4.11 Determination of carbonyl compounds content

It shall be conducted according to the specified provisions of 4.2 in GB/T 6324.5-2008.

Wherein the wavelength is 430 nm; Mass fraction w2 of carbonyl compounds [calculated

by formaldehyde (HCHO)], the value is expressed in %, calculated according to Equation

(3).

4.14 Determination of ethanol content

It shall be conducted according to the method specified in Annex D.

5.1 All items listed in this Standard are type inspection items, of which color scale, density,

boiling range, potassium permanganate test, moisture and acid (or alkali) are factory

inspection items. Under the normal production situation, type inspection shall be

conducted at least for one time in every month.

5.2 Methanol for industrial use shall be inspected by the mass inspection department.

The manufacturer ensures that the manufactured methanol for industrial use complies

with the requirements of this Standard.

5.3 Under the condition that raw materials and process are not changed, the actual batch

of continuously produced products is deemed as a group-batch; however, the time of

several group-batches constituting an inspection batch is usually less than one week.

6.1 Packaging containers of methanol for industrial use shall be coated with firm

marking, with the contents including manufacturer name, product name, this

Standard number, and the "Flammable Liquid" and "Poisonous Substance"

marking specified by GB 190.

6.2 The methanol for industrial use shall be packaged with clean and dry containers, and

packaging containers shall be strictly sealed.

6.4 The methanol for industrial use shall be stored dry, ventilated and cool places which

are away from sun exposure, heat and fire.

7.1 Warning against danger. Methanol is a kind of colorless, flammable liquid with a flash

point of 8°C, auto-ignition temperature of 436°C. The volume fraction of explosion range

in air for the methanol vapor is 6% - 36.5%. Methanol vapor has stimulation on nervous

system, if inhaled;

7.2 Safety measures. Wash with water immediately if methanol spills out. When

methanol catches fire, put out fire with sand, foam extinguisher, asbestos cloth, etc.. Avoid

methanol contact with skin;

......