PGH-10 palladium based catalyst for first-stage hydrogenation of pyroysis gasoline

palladium based catalyst PGH-10 for first-stage hydrogenation of pyroysis gasoline

PGH-10 serials catalysts for first-stage hydrogenation of pyroysis gasoline, composed of noble metal palladium as active component and aluminum oxide as support with adding of various additives, were mainly used in the selective hydrogenation of pyroysis gasoline C₆~C₇, C₆~C₈, C₅~C₉, which were the cracking byproducts in the process of ethylene production.

In order to meet the market demand, PGH-10A, a new brand catalyst for the first-stage hydrogenation of pyroysis gasoline, was developed by liaoning haitai sci-tech development Co.,Ltd at the beginning of this century. PGH-10A made greater improvement in water resistant, anti-arsenic, sulfur-tolerant and hydrogenation stability, etc. It was industrial applied successfully in the petrol devices of Yanshan Petrochemical, Shanghai Petrochemical, Lanzhou Petrochemical.

2. physical and chemical properties

Schedule 1  Comparison of PGH-10 and PGH-10A

The combination of support,active component and additive in  PGH-10A was more favorable to pyrolysis gasoline hydrogenation.PGH-10A has not only high chemical stability, high thermal stability and low rate of carbon formation, but also good hydrogenation,anti-water, anti-impurities, anti-high-load performance.

3. Catalyst Use Claims

3.1 Catalyst Process Operating Conditions

3.2 Composition of Hydrogenation Raw Oil

3.2.1 Disposal Oil

3.2.2 Hydrogen

3.2..3 Hydrogenation Product Index and Catalyst Lifetime

4.  Comparative Evaluation of PGH-10A with competitive Catalyst

1000 h Comparative evaluation test of PGH-10A and competitive catalyst were carried in 100ml Insulation installation. The details were showed in following:

4.1 Evaluation Device

catalyst bed temperature of the evaluation device which was imported from Xytel companies USA was controlled in three sessions. The temperature difference of insulation  bed reactor was  < ±0.5 ℃ between inside and outside. Raw materials oil, hydrogen were injected into the pre-heater and mixted. when the temperature of the mixture reached the target temperature,operating parameters were tracking controlled automatically by a computer. The reaction products were isolated after condensation: oil was injected into the product tank, exhaust gas was emptied after measurement and the bromine number and  diene value of oil were analysized.

4.2 Conditions of technological Evaluation

4.3 Evaluation Materials

Raw materials oil was the whole distillate oil C₅~C₉ pyrolysis gasoline and its properties were showed in Table 3.

Schedule 3  properties of Raw materials oil

4.4 Evaluation results

1000 h Comparative evaluation test of PGH-10A and competitive catalyst were carried in 100ml Insulation installation. The result was showed in following:

Figure 1 Comparative evaluation  results of the hydrogenation product diene value with time on stream catalyzed by  PGH-10A and competitive catalyst

1000 hours operation process(the diene value of raw materials was up to 42.53gI/100g and bromine number to 104.2gBr²/100g) indicated PGH-10A was adapted to low-grade oil and good  hydrogenation performance and its catalytic activity was considerable to competitive catalyst in Figure 1. PGH-10A has a good hydrogenation performance and stability.