# US 7,744,828 B2 · Process and apparatus for the removal of nitrogen compounds from a fluid stream

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- Number: US 7,744,828 B2
- Document ID: US7744828B2
- Status: Granted
- Kind: B2
- Application number: 11/046,097
- Filed: 2005-01-28
- Published: 2005-07-14
- Granted: 2010-06-29
- Earliest claimed: 2003-12-19
- Assignees: Uop LLC
- Inventors: Robert J. Schmidt; Andrew S. Zarchy
- Web page: https://patentgrep.com/patent/US7744828B2

## CPC

- C07C 7/13: by molecular-sieve technique
- C07C 2/66: Catalytic processes
- Y02P 20/52: using catalysts, e.g. selective catalysts
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Disclosed is a process and apparatus for removing nitrogen compounds from an alkylation substrate such as benzene. A conventional adsorbent bed can be used to adsorb basic organic nitrogen compounds and a hot adsorbent bed of acidic molecular sieve can adsorb the weakly basic nitrogen compounds such as nitrites. Water facilitates the adsorption of the weakly basic nitrogen compounds. Running an alkylation substrate stream from a fractionation column of elevated temperature and suitable water concentration to the hot adsorbent bed may be advantageous.

## Claims

### Claim 1

An alkylation system comprising:
an impurity adsorption vessel comprising:
a clay or a resin adsorbent selective for the adsorption of impurities;
an alkylation substrate feed inlet; and
a purified alkylation substrate feed outlet;
a nitrogen adsorption vessel comprising:
a denitrogenating adsorbent comprising a molecular sieve selective for the adsorption of a nitrogen compound;
an inlet for a purified substrate feed, said inlet in downstream communication with said purified alkylation substrate feed outlet;
water, having a concentration between about 20 wppm to about 500 wppm of the purified substrate feed, and
a denitrogenated alkylation substrate feed outlet; and
at least one aromatic alkylation reactor vessel comprising:
an aromatic alkylation catalyst for alkylating an alkylation agent and an aromatic alkylation substrate under alkylation conditions;
at least one alkylation reactor inlet in downstream communication with said denitrogenated alkylation substrate feed outlet; and
an alkylation reactor outlet.

### Claim 2 (depends on 1)

The alkylation system of claim 1 further comprising a heat exchanger for adjusting the temperature of a stream in a transport line in downstream communication with said purified alkylation substrate feed outlet and in upstream communication with said purified substrate feed inlet.

### Claim 3 (depends on 1)

The system of claim 1, wherein the impurity adsorption vessel is disposable.

### Claim 4 (depends on 1)

The system of claim 1, wherein the at least one alkylation reactor inlet delivers the denitrogenated alkylation substrate to the alkylation reactor vessel.

### Claim 5 (depends on 1)

The system of claim 1, wherein the alkylation reactor outlet is in upstream communication with the purified substrate feed inlet.

### Claim 6 (depends on 1)

The system of claim 1, wherein the impurity adsorption vessel operates at a temperature up to about 50° C.

### Claim 7 (depends on 1)

The system of claim 1, wherein the impurity adsorption vessel operates at a temperature up to about 38° C.

### Claim 8 (depends on 1)

The system of claim 1, wherein the impurity adsorption vessel operates at a temperature up to about 18° C.

### Claim 9 (depends on 1)

The system of claim 1, wherein the nitrogen adsorption vessel operates at adsorption conditions comprising a temperature of greater than about 125° C. and no greater than about 300° C.

### Claim 10 (depends on 1)

The system of claim 1, wherein the nitrogen adsorption vessel includes no more than about 1.0 wt-% of an alkylation agent.

### Claim 11 (depends on 1)

The system of claim 1, wherein the clay or resin of the impurity adsorption vessel is substantially saturated.

### Claim 12 (depends on 1)

The system of claim 1, wherein the molecular sieve is an acidic molecular sieve.

### Claim 13 (depends on 4)

The system of claim 4, wherein the alkylation agent is a C2 to C20 olefin.

### Claim 14 (depends on 13)

The system of claim 13, wherein the aromatic alkylation substrate is benzene and the alkylation agent is either ethylene or propylene.