**ADDITIONAL MONO-PRESSURE PLANT DATA FROM LSB INDUST RIES, INC.** 

El Dorado Chemical Company, El Dorado, AR ---Weak N itric Acid Units (Strong acid plant not included)

1. Process information

Design Production Rate of 100% nitric acid (in tons per day) East/West–400; DMW–400 ton/day

Typical Production Rate (tons per day when operatin g ) East = 304 ton/day, West 288 tons/day, DMW

= 285 tons/day,

Oxidation pressure (in pounds per square inch area [psia])

– East/West – 144.7 – 154.7 psia; DMW

– 164.7 – 174.7 psia

Absorption pressure (psia) - East/West – 114.7 – 124.7 psia; DMW – 134.7 – 144.7 psia

2. Extended absorption

Length (ft) - East/West – None; DMW – 146 ft tower with 38 trays (trays 1-25 use cooling

water in coils; trays 26-38 use chilled water)

Gal/1,000 ft3 -

Additive? NA. Water or condensate fed to mid-column for wate r balance.

If yes - name of additive -

Concentration (%) -

Addition Rate(gallons/hr) -

2. NOx continuous emission data - we would prefer to have this data for one year, for the most recen t

year that such data exist. To save your members time and also ours, 1 year of data is satisfactory.

These data should be in terms of lb of NOx/Ton of 100% nitric acid produced. Preferably the data

should be hourly, if possible. NOx emissions (in lb/hr) should be determined by the procedure mentio ned

in Subpart G - Section 60.73.

3. For units controlled by SCR, please prov ide the following parameters: No SCR unit on DMW;

Data below is for East/West Unit

Design Catalyst life (years) 10-15 yrs

Actual Catalyst life (life of catalyst for the 1 y r test period)

– Depends on when test period is. West

SCR Catalyst was replaced in December 2011. East SC R Catalyst was replaced in August 2011.

Catalyst is DNX -929 from Haldor Topsoe.

Gas Flow rate (scfm)

– 33,000

Ammonia injection rate (lb/hr) - 350

Catalyst volume (m3)

– 11.5 per SCR Unit (contains primary and secondary c atalyst)

Year operation began – SCR Catalyst changed per above

Location of SCR (before or after ga s expander)

– After gas expander

4. For units controlled by NSCR, please provide t he following parameters: NACherokee Nitrogen Company, Cherokee, AL ---No 2. Ni tric Acid Unit

1. Process information

Design Production Rate of 100% nitr ic acid (in tons per day) 600 (per previous Title V)

Typical Production Rate (tons per d ay) 575

Single Pressure -

Oxidation pressure (in poun ds per square inch area [psia]) - ~160 - 175 psia

Absorption pressure (psia)

- ~150 - 165 psia

2. Extended absorption

Length (ft) – 180 ft tower,

Gal/1,000 ft3 - See attached calculation:

Additive? See attached:

If yes - name of additive -

Concentration (%) -

Addition Rate(gallons/hr) –

Additional information:

• Process technology: Weatherly

• Absorber operating pressure ~150 - 165 psia

• Whether the absorber is extended, using refrigerate d water, etc. Extended. Refrigerated water

at the top, cooling water at the bottom.

• Current permitted NOx limit 201 ppm

• Whether SCR, NSCR or other NOx control device (e.g. peroxide) is used. None.

• Location of control device (before or after absorbe r, etc.) N/A

• Type of reaction gas used (ammonia, natural gas) N/A

• SCR Info (type of catalyst used and volume, year in stalled, operating pressure, etc.) N/A