# US 5,702,590 A · Process for the removal of mercury

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- Number: US 5,702,590 A
- Document ID: US5702590A
- Status: Granted
- Kind: A
- Application number: 08/552,978
- Filed: 1995-11-03
- Granted: 1997-12-30
- Earliest claimed: 1993-05-05
- Assignees: Dsm N.V.
- Inventors: Geert I. V. Bonte; Johannes C. J. De Kock
- Web page: https://patentgrep.com/patent/US5702590A

## CPC

- C10G 53/08: including at least one sorption step
- C10G 32/02: by electric or magnetic means
- C10G 2300/205: Metal content
- C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES

## Abstract

The invention relates to a process for the removal of mercury and/or other heavy metals from a cracker feed with the aid of an adsorbent. The process is characterized in that the feed is also subjected to magnetic filtration.

## Claims

### Claim 1

A process for the removal of mercury from a mercury-containing cracker feed, which comprises the combination of steps of:
subjecting said cracker feed to magnetic filtration; and
removing mercury from said cracker feed by contacting said cracker feed with an adsorbent.

### Claim 2 (depends on 1)

A process according to claim 1, wherein said process further comprises, after said subjecting step, further subjecting the cracker feed to microfiltration.

### Claim 3 (depends on 1, 2)

A process according to either of claims 1-2, wherein in said magnetic filtration is conducted using a magnetic filter comprising a column filled with ferro-magnetic material.

### Claim 4 (depends on 3)

A process according to claim 3, wherein said process further comprises the step of periodically regenerating said magnetic filter by disconnecting the magnetic field and flushing said magnetic filter with a gas or liquid.

### Claim 5 (depends on 1, 2)

A process according to claim 1 or 2, wherein said process is conducted at a temperature of -30.degree. C. to 120.degree. C.

### Claim 6 (depends on 1, 2)

A process according to claim 1 or 2, wherein said adsorbent contains sulphur in the form of a mercapto group, a polysulphide group or a metal sulphide.

### Claim 7 (depends on 1, 2)

A process according to claim 1 or 2, wherein said process further comprises the step of adding a magnetic or magnetizable component to the cracker feed in combination with a chemical coagulator, and then subjecting said cracker feed to said magnetic filtration.

### Claim 8 (depends on 7)

A process according to claim 7, wherein said magnetic or magnetizable component comprises magnetite.

### Claim 9 (depends on 1, 2)

A process according to claim 1 or 2, wherein said cracker feed comprises gas condensate, naphtha, or liquid natural gas.

### Claim 10 (depends on 3)

A process according to claim 3, wherein said process is conducted at a temperature between 0.degree. C. and 60.degree. C.

### Claim 11 (depends on 1, 2)

A process according to claim 1 or 2, wherein said magnetic filtration is conducted at a magnetic field strengths of 0.01 to 10 Tesla.

### Claim 12 (depends on 1)

A process according to claim 1, wherein said process further comprises removing particles in the range of 0.1 to 10 um from the cracker feed following said magnetic filtration.