Warehouse receipts can be used for futures delivery, which is very strict (but it is said that PTA produced by general manufacturers can be delivered)
PTA is the abbreviation of purified terephthalic acid. White powdery crystal at room temperature, non-toxic, flammable. If mixed with air, it will burn in case of fire within a certain limit. PTA is the main raw material for producing PET.
Exchange delivery standards are as follows:
PTA futures delivery standard
1, reference standard: sh/t1612.1-2005.
Test method of project index
First-class products
Appearance white powder self-test a
Acid value, mg KOH/g 675 2 675 2 sh/t1612.2.
P-carboxybenzaldehyde mg/kg 25 25 sh/t1612.7 (arbitration method), SH/T 1687.
Ash, mg/kg 8 15 GB/T 753 1.
Total amount of heavy metals (molybdenum, chromium, nickel, cobalt, manganese, titanium and iron), mg/kg 510 sh/t16/2.3, sh/t16/2.5.
Iron, mg/kg12 sh/t1665 438+0 2.3.
Water content,% (mass fraction) 0.2 0.5 SH/T 16 12.4.
5g/ 100mL DMF chromaticity, platinum and cobalt color number1010 GB/t 3143.
P-toluic acid, mg/kg150 200 sh/t1612.7 (arbitration law)
SH/T 1687
B* Supply and demand agreement SH/T1612.10
Above 250 μm,% (volume fraction) is agreed by both the supplier and the demander as SH/T 16 12.8.
Particles smaller than 45 μm,% (volume fraction)
D50 degree, micron
minute
cloth
or
Above 250 μm,% (mass fraction) is agreed by both the supplier and the buyer in Appendix A.
Less than 45 microns,% (volume fraction)
Average particle size, μm
A. Evenly distribute appropriate samples on white utensils or filter paper for visual inspection.
B, firstly, prepare the sample into 5g/ 100mL dimethylformamide (DMF) solution and filter it. Take the filtrate and determine it according to GB/T3 143.
2.SH/T16121-2005 Provisions on Packaging, Marking, Transportation and Storage
(1) The bagged products are packed with plastic film, and the net weight of each bag is 1000g. The name, address, trademark, product name, grade, batch number, net content and code number of this standard shall be printed on the packaging bag.
(2)PTA products should be fireproof, moistureproof and antistatic during transportation. Bagged products should be handled with care to prevent packaging damage; When loading and unloading tank cars, attention should be paid to controlling the loading and unloading speed to prevent static electricity.
(3)PTA products should be stored in a cool, ventilated and dry warehouse, away from seeds and heat sources, and stored separately from oxidants, acids and alkalis. Should avoid the sun and rain, should not be stacked in the open air.
3. Safety requirements
(1)PTA is a flammable substance, which is in danger of burning in case of high heat, open flame or contact with oxidant. PTA dust is explosive. Therefore, attention should be paid to closed operation in the process of product production and loading and unloading, and necessary ventilation and protective measures should be taken in the workplace to prevent product leakage and dust accumulation.
(2)PTA is a low toxic substance, which can stimulate skin and mucous membrane. For allergic people, contact with this product may lead to rash and bronchitis. The maximum allowable concentration in the air is 0. 1mg/m3.