CN1393282A - Deamidizing agent - Google Patents

Abstract

A novel deaminating agent for hydrocracking dry gas is prepared from active aluminium oxide (50-90%) and citric acid (10-50) and is used for remove trace quantity of ammonium in hydrocracking ary gas. Its advantage is high effect (less than 0.5 ppm in dry gas) for fully reclaiming hydrogen gas.

Description

Novel deaminating agent

The invention relates to a novel deamination agent.

At present, low-pressure gas separated by a FA-104 low-pressure separator of a hydrocracking unit of a 2# aromatic hydrocarbon integrated unit of a refining department of a plurality of domestic large-scale chemical plants and oil refineries: the hydrocracking dry gas is consumed as fuel gas all the time, and H in the gas₂The content of (A) is 65-70%, but residual NH still exists after the gas is treated by amine₃5PPM and H₂S5PPM causes troubles to the recycling of the components, thus causing serious environmental pollution. If the hydrocracking dry gas is fed into a reforming workshop and is compressed and purified by GB-302 to recycle hydrogen, salt is easy to accumulate during pressurization, and 2 trace NH is easy to accumulate during the hydrogen production process₃And H₂S can cause damage to the activity and the service life of various catalysts for hydrogen production, namely the hydrogen production effect is unreasonable.

The invention aims to provide a novel deaminating agent for removing residual NH in hydrocracking dry gas separated by a low-pressure separator in a hydrocracking device₃And H₂S, purifying the mixture to obtain the purified product,then the hydrogen in the purified gas is fully recycled.

The invention aims to realize that the deamination agent consists of 50-90% of alumina and 10-50% of citric acid, the deamination agent is in a white sphere shape with phi 2.5-5 or in a white strip shape with phi 2.5 multiplied by 5-10, and in the deamination process of hydrocracking dry gas, trace ammonia in raw material gas can carry out rapid acid-base reaction on the surface of the deamination agent, and the generated salt is absorbed by the deamination per se.

The novel deamination agent has the following advantages: can rapidly remove trace NH remained in gas₃Absorbed and used under the condition of normal temperature, and has higher ammonia capacity and purification degree.

The novel deamination agent consists of active aluminum oxide and citric acid, and has the following technical indexes:

appearance: white sphere with phi of 2.5-5mm or white strip with phi of 2.5 multiplied by 5-10mm

Bulk density KG/L: 0.7-1.1 specific surface m²/g：780

Pore volume: ml/g: greater than 0.4

Active components: alumina%: 90-50 crushingstrength N/cm: 750 (strip)

Citric acid%: 10-50N/particle:>30 (spherical)

Breakthrough ammonia volume%: purification degree ppm>5:<0.5

The deamination agent is suitable for operating the deamination agent under the normal temperature condition of 10-50 ℃ and the operation pressure of normal pressure to 3.0Mpa and the airspeed of 500-1000h^-1And under the condition that the ratio of the height of the storehouse to the diameter of the tower is more than 4, absorbing trace ammonia in the feed gas, so that the trace ammonia carries out rapid acid-base reaction on the surface of the deamination agent, and the generated salt is absorbed by the deamination agent, wherein the chemical reaction formula is as follows:

the ammonia penetrating capacity of the raw material gas after being treated by the deamination agent is more than 5 percent, and the purification degree of ammonia is less than 0.5 ppm.

Claims (1)

1. A novel deaminating agent is characterized in that: the deamination agent consists of 90-50% of activated alumina and 10-50% of citric acid.