Richard Holl also pioneered new air pollution control methods and earned a First Award in a contest by the EPA for designing and installation the most cost effective and efficient air pollution control system.

Richard Holl developed one of the world’s most compact heat exchangers, the Spherematrix® exchanger, available for non-exclusive licensing.

Together with Fareed Al-Hudaib, Richard Holl established Gulf Engineering Company, Dammam, Saudi Arabia’s first Saudi heat exchanger manufacturing plant and licensed to it the Spherematrix® Heat Exchanger.

He also held guest lectures on industrial heat exchanger design at KACST University, Dhahran, Kingdom of Saudi Arabia.

Holl-Reactors® are now in operation at the world’s largest chemical company with 86,000 employees and has been in operation in petroleum desulfurization processes at several locations, achieving reduction of sulfurous compounds to well below 5 ppm.

Holl-Reactors® are protected by US Patents 8,298,493 and 7,780,927. Patents available for sale or licensing.

Basic Holl-Scrubber™ Data

Capacity : 1,000 CFM
Pressure Drop: 2 Inches Water Gage
Particulate Removal Efficiency: 99.9% with Arizona Road Dust = 0.3 micrometers average particle size
Inlet Grain Loading for Test: 2 grains per cu.ft = 0.13 g per ft^3

Two Prominent Competitive Scrubber Designs: Venturi Scrubber

Packed Tower Scrubber

Scrubbers may be classified by pressure drop as follows:

  • Low-energy scrubbers have pressure drops of less than 12.7 cm (5 in) of water.
  • Medium-energy scrubbers have pressure drops between 12.7 and 38.1 cm (5 and 15 in) of water.
  • High-energy scrubbers have pressure drops greater than 38.1 cm (15 in) of water.

However, most scrubbers operate over a wide range of pressure drops, depending on their specific application, thereby making this type of categorization difficult.

Another way to classify wet scrubbers is by their use – to primarily collect either particulates or gaseous pollutants. Again, this distinction is not always clear since scrubbers can often be used to remove both types of pollutants.

Wet scrubbers can also be categorized by the manner in which the gas and liquid phases are brought into contact. Scrubbers are designed to use power, or energy, from the gas stream or the liquid stream, or some other method to bring the pollutant gas stream into contact with the liquid.

The HOLL-REACTOR® surpasses the state of the art in chemical reactor technology

1g of water contains 3.3422 molecules. Other liquid reagents contain similarly large numbers of molecules per gram.

It is obvious that when two liquid reagents are brought into contact with one another for initiating a chemical reaction, the task of bringing astronomical numbers of reagent molecules into one-on-one contact in a minimum amount of time is an equally colossal task. Conventionally, the propeller stirred chemical tank reactor has been trying to fulfill this task along with battling an additional host of problems, some of which are as follows: achieving and maintaining uniform temperature control and uniform distribution of reagents within a minimum of time. This can require seconds, minutes, hours and days, depending on how eagerly the reagents want to react.

The economics of chemical reacting demands minimizing time and effort used for uniformly mixing reagent molecules while maintaining optimum temperature and pressure control. In general, the latter two requirements are the easiest to achieve while obtaining uniform mixing of the reagents remains to this day the main problem of chemical reactor design.

The above illustrations show the side view and crossection of a typical, conventional tank reactor as mostly used in the chemical and biochemical industries.

To solve the above described problems associated with conventional chemical reactors, Richard Holl, PE, developed the Holl-Reactor® (US Patents issued) which no longer employs vigorous stirring of reagents by propeller stirring. Instead, the reagents are extremely fast sheared inside a small annular gap established between the inner surface of a stationary tube and the outer surface of a fast spinning inner tube. The reagents are being pumped through this annular gap while their temperature is being regulated by an annular heat exchanger mantle, wrapped around the stator tube, much like in the mixing example illustrated below:

Beginning of admixing molasses to upward flowing milk

Fully developed, highly efficient annular shear-mixing in a transparent Holl-Reactor®

The main reason for the HOLL-REACTOR’s® superior performance is the replacement of slow propeller-stirred mixing by high speed shear-mixing.

Propeller stirred mixing is also associated by high power consumption, amply described in the following pertinent publications:

    1. “Mixing, Principles and Applications” by Dr. Shinjji Nagata, John Wiley & Sons
    2. “Turbulence Phenomena” by Dr. J. T. Davies, Birmingham University, UK
    3. “Brownian Movement” by Dr. Albert Einstein
    4. “The kinematics of mixing: stretching, chaos, and transport” by J.M Ottino

Surprisingly, the power consumption of HOLL-REACTORS® has been measured to be less than 20% that of propeller stirred reactors. The fundamental explanation for this low power use is the HOLL-REACTOR’s® similarity with the operating principle of lubricated journal bearings; the only difference with the HOLL-REACTOR® being the use of liquid reagents instead of oils for lubrication.

One of HOLL-REACRTOR’s® main features is the unique fact that it has surpassed the state of the art in selectivity and yield in chemical reactions.

Why Using A Holl-Reactor®

1. The HOLL-Reactor® technology is a continuous process. According to the Chemical Engineers Handbook, continuous processing is roughly 30% cheaper than batch-wise processing.

2. HOLL-Reactors® have no scale–up problem, as its hydraulic radius remains constant at all sizes.

3. HOLL-Reactors® cost less than 1/20 of conventional batch reactors.

4. HOLL-Reactors® require no shafts, no seals and no bearings. They also can be made from chemically impervious materials at low cost.

5. HOLL-Reactors® consume only a small fraction of the operating energy used by conventional reactors.

6. Synthetic processes performed in HOLL-Reactors® require less solvent volumes than in batch reactors.

7. Products obtained in HOLL-Reactors® are of higher purity.

8. Processes run in HOLL-Reactors® are continuously self-cleaning

9. HOLL-Reactors® can run unattended and continuously for extended periods of time, reducing operating cost.

10. HOLL-Reactors® can safely synthesize high explosives, such as nitro-glycerine, HMX and RDX at high throughput. Explosion risks are minimized because of the unique, low- to sub-milliliter HOLL-Reactor® volume , even in large units.

11. The HOLL-Reactor® technology can operate hermetically enclosed and thus poses zero air pollution and safety risk.

12. The new HOLL-Reactor® technology is totally bypassing the classic and ubiquitous batch reactor method, as well as the more fashionable and modern micro-reactor technologies.

Share this Page: