“Market introduction of products and technologies for the circular economy”



About Us

Chemconserve, originally established by the late Dim Kesber, is an innovative company dedicated to the re-use of critical raw materials. The portfolio of completed projects since 1986 reflects how we have applied technology to re-use materials and contributed to the circular economy.

Our current business activities consist of the trade of TriphenylPhosphine (TPPO) by
Chemconserve and the creation and market introduction of hydrophobicity in wood flour for application in Wood Polymer Composites through our subsidiary company CCWood. More information on the latter can be found on the website The trade of TPPO has been one of the company activities for more than 20 years. Our product has been re-used in various applications in chemical production as a result of the exceptionally high levels of purity, and absence of TPP or other organics.

The management has been partially renewed in March 2014 to continue the supply of high-quality TPPO and find innovative technical applications for specialty chemicals.

Past Projects



In 2017 we concluded the EU financed H2020 project REEcover

The REEcover project aimed to contribute to European security of supply of Rare Earth Elements (REEs), bringing forward SME competence and business opportunities in the REE recovery area, as well as strengthening ties between SMEs and innovative research- and education institutions.
As such, the project has developed, demonstrated and assessed the viability of recovering REEs, primarily Dysprosium (Dy) and Neodymium (Nd), that are especially critical to the European economy – from two types of industrial wastes:
1. Apatite tailings from the iron ore industry
2. Magnetic waste material from the WEEE recycling industry
These two waste streams were chosen because chosen because of:
• Their complementarity in characterics,giving specific demands on the recovery technologies to be developed
• Closed-loop-recycling ambitions and resource efficiency targets
REEs from raw materials largely end up in WEEE-waste or in mining waste, and instead of being deposited in tailing dams or by smelters as slags/dust, they can become valuable REE-based products for further use.
The results of the project are available for licensing by industry. See for this the enclosed brochure (attachment)
In the story board an overview of the need for REE recycling and how REEcover has contributed to solving this problem in popular science terms is provided: REEcover Storyboard

REluc: EU project on the recovery of Rare Earth phosphors from TL tubes

Separation of fatal blends in storage tanks

Additive for Coal/Water slurry in piped transportation

CS2 insoluble sulphur as reinforcement in automotive tyres

Supercritical purification of Rare Earth mixtures

Reselling of AlfaMethylStyreneDimer (AMSD) and Bisphenol S.

Reduction of TPPO with Silanes

Selective oxidations using TEMPO radicals

The Team

Marco Pieterse

Co-founder of Chemconserve BV
Responsible for project and business development

Marco Th.A. Pieterse

(MSc Wageningen University) is an early stage technology venture development specialist, with background in venture capital (World bank, Gilde Investments), and with experience in broad range of clean technology ventures, including energy technologies, agribusiness and water technologies. Particular focus as a venture developer on the conversion of innovative technology into marketable products.

Experience includes business planning and fund raising (several early stage companies), exiting of investments (e.g. successfully sold ECN’s fuel cell technologies to HC Starck and FCE), and licensing deals (e.g. licensing rare earth recycling technology to a large industrial conglomerate). Currently involved as an entrepreneur in several early stage companies.

Kees R. Nederveen

Co-founder of Chemconserve BV
Responsible for technology development and chemical trade

Kees R. Nederveen

(MSc Utrecht University) is organometallic chemist and business economist of Utrecht University by training. He achieved 40 years of industrial experience, of which six years at DuPont International Switzerland in product management and market development of spunlaced fabrics. His career brought him in Akzo Nobel business management of Specialty Chemicals, followed by selection of joint venture partners for new Plant Investments and strategies in Asia/Pacific with successes in China, India and Malaysia.

Kees completed his industrial career as SBU President of Diosynth Inc North America, in manufacture and marketing of Active Pharmaceutical Ingredients. Has been involved in Deka Holding BV since 1998 as an Associate and acquired most activities from Deka Holding as a co-founder of Chemconserve BV.

Triphenylphosiphine oxide


Synonyms: TPPO
CAS number: 791-28-6
EINECS number: 212-338-8
Formula: [C6H5]3 OP; [C18H15] OP
Molecular weight: 278.29
HTS number: 29310095 (TSCA)
Water hazard class 2: hazardous to water

• Very high purity of 99.98%
• EU-origin
• Compliant with REACH regulations
• Product of choicefor multinationals
• No detectable TPP or other organics

• Flame retardant
• Organic synthesis a.o. dehydrogenation to unsaturated compounds
• Crystallizing agent
• Epoxy curing agent
• Anti-fouling agent in ethylene furnaces
• Metal extract and together with TOPO
• As polymer film in capacitors

Storage facilities
Storage facilities and logistic handling of our TPPO is carried out by Tigro Industries NV of Lommel, Belgium, a highly experienced warehousing and logistics company for customers in the industrial market, such as chemicals and pharma. For chemical goods specifically, Tigro Industries offers extra services like repackaging (e.g. big bags), blending, drying, micronising, formulising and labelling (traceability). Tigro offers a qualitative, trustworthy, safe and efficient solutions concerning storage, distribution and the handling of our products.

Packaging options
• 35 kg net UN-approved fiberboard drums in sealed plastic bags
• 40 kg fiber drums (2* 20 kg bags inside)
• Other packaging requirements are available upon request.

Product Analysis

Product analysis
Analysis by the Faculty of Sciences of the Vrije Universiteit Amsterdam, Department of Chemistry and Pharmaceutical Sciences, Division of Organic Chemistry, Dr. Chris Slootweg: “Shown is a GC/MS analysis of the sample, indicating 99.98% purity on gas chromatographic basis (topmost graph). Specifically, no presence of Triphenylphosphine could be detected at its characteristic GC retention time of 9.69 minutes (middle graph, insert of topmost graph). The analytic methodology used allows us to detect triphenylphosphine quantities down to 0.08% (not shown). The mass spectroscopy results of the predominant chemical component in the sample confirm that the component comprising 99.98 % wt. is indeed TPPO (bottom graph).”

Solubility Partly soluble in water, soluble in aromatic hydrocarbons, ether, chloroform, acetone, slightly soluble in ethanol
Melting point 155 °C
Flash point 180 °C
Boiling point 360 °C
Odor weak, characteristic
Bulk density 0.7 kg
Sort of Test: Typicals: Requirements:
Appearance Cream colored powder Cream coloured powder
Loss on drying (1 hour at 105 °C) 0,16%w Min 0,2%w
Melting point 156,5 °C Min 155 °C
Assay dry product 99.8%w Min 99,5%w
TPP 0,08%w (under detection limit) Max 0,2%w
Water (by KF) 0,077%w Max 0,1%w


Marco Pieterse


Contact us: