Exhibit 99.1

                  ENERGY BIOSYSTEMS ANNOUNCES PRIVATE OFFERING

         THE  WOODLANDS,   TEXAS  (November  20,  1996)  --  Energy   BioSystems
Corporation  (Nasdaq:  ENBC)  announced  today that it has  commenced  a private
offering  of up to  600,000  shares  of  Series B  Convertible  Preferred  Stock
("Preferred  Stock") at $50.00 per share.  The Company  also  announced  that it
entered into an agreement with Petrolite  Corporation (Nasdaq:  PLIT) in October
1996  providing  the Company with the option to amend the terms of its strategic
alliance with Petrolite.
         The proposed  terms of the  Preferred  Stock provide for the payment of
dividends,  which may be paid, at the Company's  option, in cash or common stock
or a  combination  thereof,  at an annual  rate  equal to $4.00 per share to the
extent paid in cash and $4.50 per share to the extent paid in common stock.  The
shares of Preferred Stock will be convertible  into common stock at a conversion
price reflecting a premium over the market price of the common stock at the time
of issuance,  subject to adjustment under certain  circumstances.  The Preferred
Stock may be redeemed at the option of the Company, under certain circumstances,
after the second anniversary of the closing of the offering, and will be subject
to mandatory  redemption on the fifth anniversary of the closing.  In each case,
the redemption price will be $50.00 per share payable,  at the Company's option,
in cash or common  stock.  The  Company  will agree to use its  reasonable  best
efforts to file a  registration  statement to cover the resale of the underlying
common stock.
         The Company  intends to use the  proceeds  of the  offering to fund the
continued development of its biocatalytic  desulfurization  technology,  to make
the  payments  contemplated  by the  Petrolite  option  agreement,  for  capital
expenditures, and for working capital and general corporate purposes.
         The private  offering of the  Preferred  Stock has not been  registered
under the  Securities  Act and will be made in reliance on  exemptions  from the
registration requirements of the Securities Act. Shares of





Preferred  Stock may not be offered  or sold by the  purchasers  of such  shares
without  registration  under the Securities Act or an applicable  exemption from
registration.
         The  Petrolite  option  agreement  provides  for the  reduction  of the
percentage of site license fees and adjusted gross profits  payable to Petrolite
under the Company's existing strategic alliance agreement with Petrolite to 9.5%
from 22%. In exchange  for the  reduction,  the Company  would pay  Petrolite an
aggregate  of $10  million  in cash,  issue a  warrant  entitling  Petrolite  to
purchase  Common  Stock of the Company with an  aggregate  exercise  price of $1
million  and  assume  responsibility  for  servicing  the BDS units  on-site  at
customer  locations.  The option  agreement  also  provides for the extension of
Petrolite's  obligations to provide  operational  and technical  support for the
Company's  biocatalytic  desulfurization  pilot  plant  from  September  1, 1996
through December 31, 1998.
         St. Louis-based  Petrolite  Corporation is a specialty chemical company
offering integrated technologies to meet the needs of customers in a dozen major
markets in more than 30 countries.  Its products and services,  especially those
for   energy-related   industries,    include   chemical   treatment   programs,
performance-enhancing  additives, process equipment and engineering services. It
also manufactures and markets  proprietary  polymers used as additives in a wide
range of industrial and consumer product applications.
         Energy  BioSystems   Corporation,   of  Houston,   is   commercializing
biotechnology-based   processes  for  the  petroleum   refining  and  production
industries.  The  Company's  focus to date has been on  developing  biocatalytic
desulfurization,  a proprietary  process involving the use of bacteria to remove
sulfur from petroleum.  This process is expected to help refiners worldwide meet
environmental  regulations in a more cost-effective manner and has the potential
to greatly improve the value of high-sulfur crude oil reserves.