1. Purpose
THC-2 precious metal dehydrogenation catalyst is used for the removal and purification of lower alkanes, alkenes, alkynes, as well as low-carbon alcohols and aldehydes in food grade gases such as CO2or N2. This catalyst has the characteristics of high low-temperature activity, high removal efficiency (CH4≤ 5 ppm, benzene≤ 20 ppb), good anti toxicity and thermal stability, and long service life (1-3 years).
Our center has jointly applied for and obtained the national invention patent authorization for a new method of hydrocarbon removal (JTL-1 sandwich cake fine desulfurization process+THC-1 precious metal hydrocarbon removal catalyst) with Hangzhou Kuaikai High Efficiency Energy saving New Technology Co., Ltd; This new method is mainly designed to meet the requirements of international standard food grade CO2 for precision desulfurization, dealkylation, and benzene removal. The product quality can be certified by Coca Cola and PepsiCo companies.
2. Technical principles for the removal of hydrocarbons, CO, H2and low-carbon alcohols and aldehydes;
Catalytic combustion method is used to remove hydrocarbons, CO, H2, low-carbon alcohols, and aldehydes. The principle is:
CH4 + 2 O2 → CO2 + 2H2O
C6H6 + 15/2O2 → 6CO2 + 3H2O
CxHy + O2 → x CO2 + y/2H2O
CxHy O2 + O2 → xCO2 + y/2 H2O
2CO + O2 → 2CO2
2H2 + O2→ 2 H2O
Combustible gas components are catalytically oxidized to CO2and H2O.
III. Main Physical Properties
|
Composition |
Pt-Pd-Al2O3 |
Bulk density |
0.5 ~ 0.7 |
|
Appearance |
Grey spherical shape |
Compressive strength |
≥ 20 N/piece |
|
Granularity |
ф2~4 |
Specific surface area |
140~250 m2/g |
IV. Process and Technical Parameters
1. Composition of raw gas
(a) Imported total hydrocarbons (calculated as methane) in food grade CO2are 5000ppm.
(b) The total amount of hydrocarbons, low-carbon alcohols, and aldehydes in the carrier gas used for the production of polyester slices is 5000ppm. The total hydrocarbons are calculated as methane, while low-carbon alcohols and aldehydes mainly include methanol, ethylene glycol, acetaldehyde, etc.
(c) For items a and b, the total sulfur at the inlet is 0.1 ppm; Imported gas does not contain oil.
2. Process indicators
(a) In food grade CO2, the total export hydrocarbons are 50ppm (including 20ppm of methane) and 20 ppb of benzene.
(b) The total amount of hydrocarbons (calculated as methane) and low-carbon alcohols and aldehydes exported from the carrier gas used in the production of polyester slices is 5ppm.
3. Process conditions
Airspeed: 1000~1500 h-1; Work pressure: atmospheric pressure~16.0 MPa
Import temperature: 320~470 ℃;
Explanation: The inlet temperature is related to the CH4content in the gas. The higher the CH4content, the higher the inlet temperature of the catalyst bed.
4. Oxygen addition amount
Food grade CO2: The outlet O2of the dehydrogenation tower is 0.2~0.3%
Polyester slicing: tentatively set at theoretical consumption of O2+50~300 ppm
5. Service life
The service life of the catalyst is 1 to 3 years.
